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Logarithms

Forums Forums SIMPOL Programming Logarithms

Viewing 9 posts - 1 through 9 (of 9 total)
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  • #3508
    JD Kromkowski
    Participant

    Don’t we have a Logarithm function? I can’t seem to find it?

    #3509
    Michael
    Keymaster

    Hi John,

    Not currently. Most decent log functions seem to actually just be stored look-up tables as far as I can remember, they don’t actually calculate anything, they just look up a value to save time.

    Ciao, Neil

    #3513
    JD Kromkowski
    Participant

    Yeah. So…we make math.h part of the C components of SIMPOL?

    #3518
    Michael
    Keymaster

    That is a possibility, but we would need to assess how that affects our integer and number types, since we don’t artificially limit precision in numbers and integers.

    Ciao, Neil

    #3522
    JD Kromkowski
    Participant

    This first works reasonably fast and is reasonably accurate for n less that 4. Following is one that is pretty fast for most integers. Next is one that is very accurate if you have all day. Finally, my C is not good enough to translate the last one. If no math.h, then there is solution made up of some combination.

    //************************************************************************
    //* Kromkowski log for less than 4
    //* Based on http://www.convict.lu/Jeunes/ultimate_stuff/exp_ln_2.htm
    //************************************************************************
    constant sLOG2_10 “3.32192809489”

    function main()
    integer d
    number n
    number ans2
    number ans10
    number pow2
    number numer
    number denom
    number eval
    integer e
    string message,title
    anyvalue prompt
    message = “Entry a number.”
    title = “log test”
    prompt = “”
    e = 0
    n = .toval(getuserinput(message,title,prompt, error =e),””,10)
    array digits
    digits =@ array.new()

    array LUT
    LUT =@ array.new()
    LUT[0] = “2.00000000000000000”
    LUT[1] = “1.41421353816986084”
    LUT[2] = “1.18920707702636719”
    LUT[3] = “1.09050774574279785”
    LUT[4] = “1.0442737340927124”
    LUT[5] = “1.02189719676971436”
    LUT[6] = “1.010889176330566”
    LUT[7] = “1.00542986392974853”
    LUT[8] = “1.00271129608154297”
    LUT[9] = “1.00135469436645508”
    LUT[10] = “1.00067710876464844”
    LUT[11] = “1.00033855438232422”
    LUT[12] = “1.00016927719116211”
    LUT[13] = “1.00008463859558105”
    LUT[14] = “1.0000423929779053”
    LUT[15] = “1.00002110004425049”
    LUT[16] = “1.00001060962677002”
    LUT[17] = “1.00000524520874023”
    LUT[18] = “1.00000262260437012”
    LUT[19] = “1.00000131130218506”
    LUT[20] = “1.0000007152557373”
    LUT[21] = “1.00000035762786865”
    LUT[22] = “1.00000011920928955”
    numer = n
    d = 0
    while d < 15
    denom = .toval(LUT[d],””,10)
    eval = numer/denom
    if eval < 1
    digits[d] = 0
    else
    digits[d] = 1
    numer = eval
    end if
    d = d + 1
    end while

    ans2 = 0
    ans10 = 0
    d = 0
    while digits[d] <> .nul
    pow2 = .fix(1/raisetopower(2,d),raisetopower(10,d+2))
    ans2 = ans2 + .fix((digits[d] * pow2),10000000000000)
    d = d+1
    end while
    ans10 = .fix(ans2/.toval(sLOG2_10,””,10),100000000000000)
    end function “The log of ” + .tostr(n,10) + ” is:{d}{a}” + .tostr(ans10,10)

    ****************************************************

    //************************************************************************
    //* Kromkowski log for most integers c2017
    //* When is it better to use a table rather than an array?
    //* Should be a way to turn any number into an integer keep track of multiplier
    //* And then use identity eg log(5.4) = log(54) – log(10)
    //************************************************************************

    function main()
    number n,p,q
    integer e
    e = 0
    string message,title
    anyvalue prompt
    message = “Entry an integer.”
    title = “log test”
    prompt = “”
    n = .toval(getuserinput(message,title,prompt, error =e),””,10)

    datetime dt
    dt=@ datetime.new()
    dt.setnow()
    array primes
    primes=@ array.new()
    array logs
    logs =@ array.new()
    LoadPrimes(primes, logs)

    array factors
    factors=@ array.new()
    integer t, i
    number answer
    string sResult
    sResult = “”
    i = 0

    factor(factors,n,primes)
    answer = 0
    while factors <> .nul
    answer = answer + logs[factors,”log”]
    i = i + 1
    end while

    sResult = .tostr(answer,10) + “is the log of ” + .tostr(n,10)
    t=datetime.new().setnow() – dt
    sResult=sResult + “{d}{a}” + “Time required was ” + .tostr(t/1000000000000,10) + “{d}{a}”
    end function sResult

    function factor(array factors, integer n, array primes)
    integer x
    x=n
    integer j, i, count
    count = primes.count()
    j=0
    i=1
    while i < count and i < sqrt(n,14) +1
    while n mod primes== 0
    factors[j]=primes
    n=n/primes
    j=j + 1
    end while
    i=i + 1
    end while
    if n <> 1
    factors[j]=n
    end if
    string test
    test=”here”
    end function

    function LoadPrimes(array primes, array logs)
    primes[1]=2;logs[primes[1],”log”]=.toval(“0.301029995663981″,””,10)
    primes[2]=3;logs[primes[2],”log”]=.toval(“0.477121254719662″,””,10)
    primes[3]=5;logs[primes[3],”log”]=.toval(“0.698970004336019″,””,10)
    primes[4]=7;logs[primes[4],”log”]=.toval(“0.845098040014257″,””,10)
    primes[5]=11;logs[primes[5],”log”]=.toval(“1.041392685158230″,””,10)
    primes[6]=13;logs[primes[6],”log”]=.toval(“1.113943352306840″,””,10)
    primes[7]=17;logs[primes[7],”log”]=.toval(“1.230448921378270″,””,10)
    primes[8]=19;logs[primes[8],”log”]=.toval(“1.278753600952830″,””,10)
    primes[9]=23;logs[primes[9],”log”]=.toval(“1.361727836017590″,””,10)
    primes[10]=29;logs[primes[10],”log”]=.toval(“1.462397997898960″,””,10)
    primes[11]=31;logs[primes[11],”log”]=.toval(“1.491361693834270″,””,10)
    primes[12]=37;logs[primes[12],”log”]=.toval(“1.568201724067000″,””,10)
    primes[13]=41;logs[primes[13],”log”]=.toval(“1.612783856719740″,””,10)
    primes[14]=43;logs[primes[14],”log”]=.toval(“1.633468455579590″,””,10)
    primes[15]=47;logs[primes[15],”log”]=.toval(“1.672097857935720″,””,10)
    primes[16]=53;logs[primes[16],”log”]=.toval(“1.724275869600790″,””,10)
    primes[17]=59;logs[primes[17],”log”]=.toval(“1.770852011642140″,””,10)
    primes[18]=61;logs[primes[18],”log”]=.toval(“1.785329835010770″,””,10)
    primes[19]=67;logs[primes[19],”log”]=.toval(“1.826074802700830″,””,10)
    primes[20]=71;logs[primes[20],”log”]=.toval(“1.851258348719080″,””,10)
    primes[21]=73;logs[primes[21],”log”]=.toval(“1.863322860120460″,””,10)
    primes[22]=79;logs[primes[22],”log”]=.toval(“1.897627091290440″,””,10)
    primes[23]=83;logs[primes[23],”log”]=.toval(“1.919078092376070″,””,10)
    primes[24]=89;logs[primes[24],”log”]=.toval(“1.949390006644910″,””,10)
    primes[25]=97;logs[primes[25],”log”]=.toval(“1.986771734266240″,””,10)
    primes[26]=101;logs[primes[26],”log”]=.toval(“2.004321373782640″,””,10)
    primes[27]=103;logs[primes[27],”log”]=.toval(“2.012837224705170″,””,10)
    primes[28]=107;logs[primes[28],”log”]=.toval(“2.029383777685210″,””,10)
    primes[29]=109;logs[primes[29],”log”]=.toval(“2.037426497940620″,””,10)
    primes[30]=113;logs[primes[30],”log”]=.toval(“2.053078443483420″,””,10)
    primes[31]=127;logs[primes[31],”log”]=.toval(“2.103803720955960″,””,10)
    primes[32]=131;logs[primes[32],”log”]=.toval(“2.117271295655760″,””,10)
    primes[33]=137;logs[primes[33],”log”]=.toval(“2.136720567156410″,””,10)
    primes[34]=139;logs[primes[34],”log”]=.toval(“2.143014800254100″,””,10)
    primes[35]=149;logs[primes[35],”log”]=.toval(“2.173186268412270″,””,10)
    primes[36]=151;logs[primes[36],”log”]=.toval(“2.178976947293170″,””,10)
    primes[37]=157;logs[primes[37],”log”]=.toval(“2.195899652409230″,””,10)
    primes[38]=163;logs[primes[38],”log”]=.toval(“2.212187604403960″,””,10)
    primes[39]=167;logs[primes[39],”log”]=.toval(“2.222716471147580″,””,10)
    primes[40]=173;logs[primes[40],”log”]=.toval(“2.238046103128800″,””,10)
    primes[41]=179;logs[primes[41],”log”]=.toval(“2.252853030979890″,””,10)
    primes[42]=181;logs[primes[42],”log”]=.toval(“2.257678574869180″,””,10)
    primes[43]=191;logs[primes[43],”log”]=.toval(“2.281033367247730″,””,10)
    primes[44]=193;logs[primes[44],”log”]=.toval(“2.285557309007770″,””,10)
    primes[45]=197;logs[primes[45],”log”]=.toval(“2.294466226161590″,””,10)
    primes[46]=199;logs[primes[46],”log”]=.toval(“2.298853076409710″,””,10)
    primes[47]=211;logs[primes[47],”log”]=.toval(“2.324282455297690″,””,10)
    primes[48]=223;logs[primes[48],”log”]=.toval(“2.348304863048160″,””,10)
    primes[49]=227;logs[primes[49],”log”]=.toval(“2.356025857193120″,””,10)
    primes[50]=229;logs[primes[50],”log”]=.toval(“2.359835482339890″,””,10)
    primes[51]=233;logs[primes[51],”log”]=.toval(“2.367355921026020″,””,10)
    primes[52]=239;logs[primes[52],”log”]=.toval(“2.378397900948140″,””,10)
    primes[53]=241;logs[primes[53],”log”]=.toval(“2.382017042574870″,””,10)
    primes[54]=251;logs[primes[54],”log”]=.toval(“2.399673721481040″,””,10)
    primes[55]=257;logs[primes[55],”log”]=.toval(“2.409933123331300″,””,10)
    primes[56]=263;logs[primes[56],”log”]=.toval(“2.419955748489760″,””,10)
    primes[57]=269;logs[primes[57],”log”]=.toval(“2.429752280002410″,””,10)
    primes[58]=271;logs[primes[58],”log”]=.toval(“2.432969290874410″,””,10)
    primes[59]=277;logs[primes[59],”log”]=.toval(“2.442479769064450″,””,10)
    primes[60]=281;logs[primes[60],”log”]=.toval(“2.448706319905080″,””,10)
    primes[61]=283;logs[primes[61],”log”]=.toval(“2.451786435524290″,””,10)
    primes[62]=293;logs[primes[62],”log”]=.toval(“2.466867620354110″,””,10)
    primes[63]=307;logs[primes[63],”log”]=.toval(“2.487138375477190″,””,10)
    primes[64]=311;logs[primes[64],”log”]=.toval(“2.492760389026840″,””,10)
    primes[65]=313;logs[primes[65],”log”]=.toval(“2.495544337546450″,””,10)
    primes[66]=317;logs[primes[66],”log”]=.toval(“2.501059262217750″,””,10)
    primes[67]=331;logs[primes[67],”log”]=.toval(“2.519827993775720″,””,10)
    primes[68]=337;logs[primes[68],”log”]=.toval(“2.527629900871340″,””,10)
    primes[69]=347;logs[primes[69],”log”]=.toval(“2.540329474790870″,””,10)
    primes[70]=349;logs[primes[70],”log”]=.toval(“2.542825426959180″,””,10)
    primes[71]=353;logs[primes[71],”log”]=.toval(“2.547774705387820″,””,10)
    primes[72]=359;logs[primes[72],”log”]=.toval(“2.555094448578320″,””,10)
    primes[73]=367;logs[primes[73],”log”]=.toval(“2.564666064252090″,””,10)
    primes[74]=373;logs[primes[74],”log”]=.toval(“2.571708831808690″,””,10)
    primes[75]=379;logs[primes[75],”log”]=.toval(“2.578639209968070″,””,10)
    primes[76]=383;logs[primes[76],”log”]=.toval(“2.583198773968620″,””,10)
    primes[77]=389;logs[primes[77],”log”]=.toval(“2.589949601325710″,””,10)
    primes[78]=397;logs[primes[78],”log”]=.toval(“2.598790506763120″,””,10)
    primes[79]=401;logs[primes[79],”log”]=.toval(“2.603144372620180″,””,10)
    primes[80]=409;logs[primes[80],”log”]=.toval(“2.611723308007340″,””,10)
    primes[81]=419;logs[primes[81],”log”]=.toval(“2.622214022966300″,””,10)
    primes[82]=421;logs[primes[82],”log”]=.toval(“2.624282095835670″,””,10)
    primes[83]=431;logs[primes[83],”log”]=.toval(“2.634477270160730″,””,10)
    primes[84]=433;logs[primes[84],”log”]=.toval(“2.636487896353370″,””,10)
    primes[85]=439;logs[primes[85],”log”]=.toval(“2.642464520242120″,””,10)
    primes[86]=443;logs[primes[86],”log”]=.toval(“2.646403726223070″,””,10)
    primes[87]=449;logs[primes[87],”log”]=.toval(“2.652246341003320″,””,10)
    primes[88]=457;logs[primes[88],”log”]=.toval(“2.659916200069850″,””,10)
    primes[89]=461;logs[primes[89],”log”]=.toval(“2.663700925389650″,””,10)
    primes[90]=463;logs[primes[90],”log”]=.toval(“2.665580991017950″,””,10)
    primes[91]=467;logs[primes[91],”log”]=.toval(“2.669316880566110″,””,10)
    primes[92]=479;logs[primes[92],”log”]=.toval(“2.680335513414560″,””,10)
    primes[93]=487;logs[primes[93],”log”]=.toval(“2.687528961214630″,””,10)
    primes[94]=491;logs[primes[94],”log”]=.toval(“2.691081492122970″,””,10)
    primes[95]=499;logs[primes[95],”log”]=.toval(“2.698100545623390″,””,10)
    primes[96]=503;logs[primes[96],”log”]=.toval(“2.701567985055930″,””,10)
    primes[97]=509;logs[primes[97],”log”]=.toval(“2.706717782336760″,””,10)
    primes[98]=521;logs[primes[98],”log”]=.toval(“2.716837723299530″,””,10)
    primes[99]=523;logs[primes[99],”log”]=.toval(“2.718501688867270″,””,10)
    primes[100]=541;logs[primes[100],”log”]=.toval(“2.733197265106570″,””,10)
    primes[101]=547;logs[primes[101],”log”]=.toval(“2.737987326333430″,””,10)
    primes[102]=557;logs[primes[102],”log”]=.toval(“2.745855195173730″,””,10)
    primes[103]=563;logs[primes[103],”log”]=.toval(“2.750508394851350″,””,10)
    primes[104]=569;logs[primes[104],”log”]=.toval(“2.755112266395070″,””,10)
    primes[105]=571;logs[primes[105],”log”]=.toval(“2.756636108245850″,””,10)
    primes[106]=577;logs[primes[106],”log”]=.toval(“2.761175813155730″,””,10)
    primes[107]=587;logs[primes[107],”log”]=.toval(“2.768638101247610″,””,10)
    primes[108]=593;logs[primes[108],”log”]=.toval(“2.773054693364260″,””,10)
    primes[109]=599;logs[primes[109],”log”]=.toval(“2.777426822389310″,””,10)
    primes[110]=601;logs[primes[110],”log”]=.toval(“2.778874472002740″,””,10)
    primes[111]=607;logs[primes[111],”log”]=.toval(“2.783188691075260″,””,10)
    primes[112]=613;logs[primes[112],”log”]=.toval(“2.787460474518420″,””,10)
    primes[113]=617;logs[primes[113],”log”]=.toval(“2.790285164033240″,””,10)
    primes[114]=619;logs[primes[114],”log”]=.toval(“2.791690649020120″,””,10)
    primes[115]=631;logs[primes[115],”log”]=.toval(“2.800029359244130″,””,10)
    primes[116]=641;logs[primes[116],”log”]=.toval(“2.806858029518820″,””,10)
    primes[117]=643;logs[primes[117],”log”]=.toval(“2.808210972924220″,””,10)
    primes[118]=647;logs[primes[118],”log”]=.toval(“2.810904280668700″,””,10)
    primes[119]=653;logs[primes[119],”log”]=.toval(“2.814913181275070″,””,10)
    primes[120]=659;logs[primes[120],”log”]=.toval(“2.818885414594010″,””,10)
    primes[121]=661;logs[primes[121],”log”]=.toval(“2.820201459485640″,””,10)
    primes[122]=673;logs[primes[122],”log”]=.toval(“2.828015064223980″,””,10)
    primes[123]=677;logs[primes[123],”log”]=.toval(“2.830588668685140″,””,10)
    primes[124]=683;logs[primes[124],”log”]=.toval(“2.834420703681530″,””,10)
    primes[125]=691;logs[primes[125],”log”]=.toval(“2.839478047374200″,””,10)
    primes[126]=701;logs[primes[126],”log”]=.toval(“2.845718017966660″,””,10)
    primes[127]=709;logs[primes[127],”log”]=.toval(“2.850646235183070″,””,10)
    primes[128]=719;logs[primes[128],”log”]=.toval(“2.856728890382880″,””,10)
    primes[129]=727;logs[primes[129],”log”]=.toval(“2.861534410859040″,””,10)
    primes[130]=733;logs[primes[130],”log”]=.toval(“2.865103974641130″,””,10)
    primes[131]=739;logs[primes[131],”log”]=.toval(“2.868644438394830″,””,10)
    primes[132]=743;logs[primes[132],”log”]=.toval(“2.870988813760580″,””,10)
    primes[133]=751;logs[primes[133],”log”]=.toval(“2.875639937004170″,””,10)
    primes[134]=757;logs[primes[134],”log”]=.toval(“2.879095879500070″,””,10)
    primes[135]=761;logs[primes[135],”log”]=.toval(“2.881384656770570″,””,10)
    primes[136]=769;logs[primes[136],”log”]=.toval(“2.885926339801430″,””,10)
    primes[137]=773;logs[primes[137],”log”]=.toval(“2.888179493918330″,””,10)
    primes[138]=787;logs[primes[138],”log”]=.toval(“2.895974732359070″,””,10)
    primes[139]=797;logs[primes[139],”log”]=.toval(“2.901458321396110″,””,10)
    primes[140]=809;logs[primes[140],”log”]=.toval(“2.907948521612270″,””,10)
    primes[141]=811;logs[primes[141],”log”]=.toval(“2.909020854211160″,””,10)
    primes[142]=821;logs[primes[142],”log”]=.toval(“2.914343157119440″,””,10)
    primes[143]=823;logs[primes[143],”log”]=.toval(“2.915399835212270″,””,10)
    primes[144]=827;logs[primes[144],”log”]=.toval(“2.917505509552550″,””,10)
    primes[145]=829;logs[primes[145],”log”]=.toval(“2.918554530550270″,””,10)
    primes[146]=839;logs[primes[146],”log”]=.toval(“2.923761960828700″,””,10)
    primes[147]=853;logs[primes[147],”log”]=.toval(“2.930949031167520″,””,10)
    primes[148]=857;logs[primes[148],”log”]=.toval(“2.932980821923200″,””,10)
    primes[149]=859;logs[primes[149],”log”]=.toval(“2.933993163831240″,””,10)
    primes[150]=863;logs[primes[150],”log”]=.toval(“2.936010795715210″,””,10)
    primes[151]=877;logs[primes[151],”log”]=.toval(“2.942999593366040″,””,10)
    primes[152]=881;logs[primes[152],”log”]=.toval(“2.944975908412050″,””,10)
    primes[153]=883;logs[primes[153],”log”]=.toval(“2.945960703577570″,””,10)
    primes[154]=887;logs[primes[154],”log”]=.toval(“2.947923619831730″,””,10)
    primes[155]=907;logs[primes[155],”log”]=.toval(“2.957607287060100″,””,10)
    primes[156]=911;logs[primes[156],”log”]=.toval(“2.959518376973000″,””,10)
    primes[157]=919;logs[primes[157],”log”]=.toval(“2.963315511386110″,””,10)
    primes[158]=929;logs[primes[158],”log”]=.toval(“2.968015713993640″,””,10)
    primes[159]=937;logs[primes[159],”log”]=.toval(“2.971739590887780″,””,10)
    primes[160]=941;logs[primes[160],”log”]=.toval(“2.973589623427260″,””,10)
    primes[161]=947;logs[primes[161],”log”]=.toval(“2.976349979003270″,””,10)
    primes[162]=953;logs[primes[162],”log”]=.toval(“2.979092900638330″,””,10)
    primes[163]=967;logs[primes[163],”log”]=.toval(“2.985426474083000″,””,10)
    primes[164]=971;logs[primes[164],”log”]=.toval(“2.987219229908010″,””,10)
    primes[165]=977;logs[primes[165],”log”]=.toval(“2.989894563718770″,””,10)
    primes[166]=983;logs[primes[166],”log”]=.toval(“2.992553517832140″,””,10)
    primes[167]=991;logs[primes[167],”log”]=.toval(“2.996073654485280″,””,10)
    primes[168]=997;logs[primes[168],”log”]=.toval(“2.998695158311660″,””,10)
    primes[169]=1009;logs[primes[169],”log”]=.toval(“3.003891166236910″,””,10)
    primes[170]=1013;logs[primes[170],”log”]=.toval(“3.005609445360280″,””,10)
    primes[171]=1019;logs[primes[171],”log”]=.toval(“3.008174184006430″,””,10)
    primes[172]=1021;logs[primes[172],”log”]=.toval(“3.009025742086910″,””,10)
    primes[173]=1031;logs[primes[173],”log”]=.toval(“3.013258665283520″,””,10)
    primes[174]=1033;logs[primes[174],”log”]=.toval(“3.014100321519620″,””,10)
    primes[175]=1039;logs[primes[175],”log”]=.toval(“3.016615547557180″,””,10)
    primes[176]=1049;logs[primes[176],”log”]=.toval(“3.020775488193560″,””,10)
    primes[177]=1051;logs[primes[177],”log”]=.toval(“3.021602716028240″,””,10)
    primes[178]=1061;logs[primes[178],”log”]=.toval(“3.025715383901340″,””,10)
    primes[179]=1063;logs[primes[179],”log”]=.toval(“3.026533264523300″,””,10)
    primes[180]=1069;logs[primes[180],”log”]=.toval(“3.028977705208780″,””,10)
    primes[181]=1087;logs[primes[181],”log”]=.toval(“3.036229544086300″,””,10)
    primes[182]=1091;logs[primes[182],”log”]=.toval(“3.037824750588340″,””,10)
    primes[183]=1093;logs[primes[183],”log”]=.toval(“3.038620161949700″,””,10)
    primes[184]=1097;logs[primes[184],”log”]=.toval(“3.040206627574710″,””,10)
    primes[185]=1103;logs[primes[185],”log”]=.toval(“3.042575512440190″,””,10)
    primes[186]=1109;logs[primes[186],”log”]=.toval(“3.044931546149160″,””,10)
    primes[187]=1117;logs[primes[187],”log”]=.toval(“3.048053173115610″,””,10)
    primes[188]=1123;logs[primes[188],”log”]=.toval(“3.050379756261460″,””,10)
    primes[189]=1129;logs[primes[189],”log”]=.toval(“3.052693941924970″,””,10)
    primes[190]=1151;logs[primes[190],”log”]=.toval(“3.061075323629790″,””,10)
    primes[191]=1153;logs[primes[191],”log”]=.toval(“3.061829307294700″,””,10)
    primes[192]=1163;logs[primes[192],”log”]=.toval(“3.065579714728450″,””,10)
    primes[193]=1171;logs[primes[193],”log”]=.toval(“3.068556895072360″,””,10)
    primes[194]=1181;logs[primes[194],”log”]=.toval(“3.072249897613520″,””,10)
    primes[195]=1187;logs[primes[195],”log”]=.toval(“3.074450718954590″,””,10)
    primes[196]=1193;logs[primes[196],”log”]=.toval(“3.076640443670340″,””,10)
    primes[197]=1201;logs[primes[197],”log”]=.toval(“3.079543007402910″,””,10)
    primes[198]=1213;logs[primes[198],”log”]=.toval(“3.083860800866570″,””,10)
    primes[199]=1217;logs[primes[199],”log”]=.toval(“3.085290578230070″,””,10)
    primes[200]=1223;logs[primes[200],”log”]=.toval(“3.087426457036290″,””,10)
    primes[201]=1229;logs[primes[201],”log”]=.toval(“3.089551882886450″,””,10)
    primes[202]=1231;logs[primes[202],”log”]=.toval(“3.090258052931320″,””,10)
    primes[203]=1237;logs[primes[203],”log”]=.toval(“3.092369699629120″,””,10)
    primes[204]=1249;logs[primes[204],”log”]=.toval(“3.096562438374140″,””,10)
    primes[205]=1259;logs[primes[205],”log”]=.toval(“3.100025730107860″,””,10)
    primes[206]=1277;logs[primes[206],”log”]=.toval(“3.106190897263420″,””,10)
    primes[207]=1279;logs[primes[207],”log”]=.toval(“3.106870544478650″,””,10)
    primes[208]=1283;logs[primes[208],”log”]=.toval(“3.108226656374930″,””,10)
    primes[209]=1289;logs[primes[209],”log”]=.toval(“3.110252917353400″,””,10)
    primes[210]=1291;logs[primes[210],”log”]=.toval(“3.110926242266420″,””,10)
    primes[211]=1297;logs[primes[211],”log”]=.toval(“3.112939976084080″,””,10)
    primes[212]=1301;logs[primes[212],”log”]=.toval(“3.114277296561590″,””,10)
    primes[213]=1303;logs[primes[213],”log”]=.toval(“3.114944415712590″,””,10)
    primes[214]=1307;logs[primes[214],”log”]=.toval(“3.116275587580540″,””,10)
    primes[215]=1319;logs[primes[215],”log”]=.toval(“3.120244795546370″,””,10)
    primes[216]=1321;logs[primes[216],”log”]=.toval(“3.120902817614530″,””,10)
    primes[217]=1327;logs[primes[217],”log”]=.toval(“3.122870922864440″,””,10)
    primes[218]=1361;logs[primes[218],”log”]=.toval(“3.133858125203340″,””,10)
    primes[219]=1367;logs[primes[219],”log”]=.toval(“3.135768514567820″,””,10)
    primes[220]=1373;logs[primes[220],”log”]=.toval(“3.137670537236760″,””,10)
    primes[221]=1381;logs[primes[221],”log”]=.toval(“3.140193678578630″,””,10)
    primes[222]=1399;logs[primes[222],”log”]=.toval(“3.145817714491830″,””,10)
    primes[223]=1409;logs[primes[223],”log”]=.toval(“3.148910993109360″,””,10)
    primes[224]=1423;logs[primes[224],”log”]=.toval(“3.153204900084280″,””,10)
    primes[225]=1427;logs[primes[225],”log”]=.toval(“3.154423973114650″,””,10)
    primes[226]=1429;logs[primes[226],”log”]=.toval(“3.155032228790970″,””,10)
    primes[227]=1433;logs[primes[227],”log”]=.toval(“3.156246190397340″,””,10)
    primes[228]=1439;logs[primes[228],”log”]=.toval(“3.158060793936610″,””,10)
    primes[229]=1447;logs[primes[229],”log”]=.toval(“3.160468531119040″,””,10)
    primes[230]=1451;logs[primes[230],”log”]=.toval(“3.161667412437740″,””,10)
    primes[231]=1453;logs[primes[231],”log”]=.toval(“3.162265614298020″,””,10)
    primes[232]=1459;logs[primes[232],”log”]=.toval(“3.164055291893450″,””,10)
    primes[233]=1471;logs[primes[233],”log”]=.toval(“3.167612672727530″,””,10)
    primes[234]=1481;logs[primes[234],”log”]=.toval(“3.170555058521210″,””,10)
    primes[235]=1483;logs[primes[235],”log”]=.toval(“3.171141151028380″,””,10)
    primes[236]=1487;logs[primes[236],”log”]=.toval(“3.172310968521950″,””,10)
    primes[237]=1489;logs[primes[237],”log”]=.toval(“3.172894697752180″,””,10)
    primes[238]=1493;logs[primes[238],”log”]=.toval(“3.174059807725030″,””,10)
    primes[239]=1499;logs[primes[239],”log”]=.toval(“3.175801632848280″,””,10)
    primes[240]=1511;logs[primes[240],”log”]=.toval(“3.179264464339030″,””,10)
    primes[241]=1523;logs[primes[241],”log”]=.toval(“3.182699903336040″,””,10)
    primes[242]=1531;logs[primes[242],”log”]=.toval(“3.184975190698260″,””,10)
    primes[243]=1543;logs[primes[243],”log”]=.toval(“3.188365926063150″,””,10)
    primes[244]=1549;logs[primes[244],”log”]=.toval(“3.190051417759210″,””,10)
    primes[245]=1553;logs[primes[245],”log”]=.toval(“3.191171455728560″,””,10)
    primes[246]=1559;logs[primes[246],”log”]=.toval(“3.192846115188840″,””,10)
    primes[247]=1567;logs[primes[247],”log”]=.toval(“3.195068996468590″,””,10)
    primes[248]=1571;logs[primes[248],”log”]=.toval(“3.196176185039970″,””,10)
    primes[249]=1579;logs[primes[249],”log”]=.toval(“3.198382130008290″,””,10)
    primes[250]=1583;logs[primes[250],”log”]=.toval(“3.199480914862360″,””,10)
    primes[251]=1597;logs[primes[251],”log”]=.toval(“3.203304916138480″,””,10)
    primes[252]=1601;logs[primes[252],”log”]=.toval(“3.204391331919300″,””,10)
    primes[253]=1607;logs[primes[253],”log”]=.toval(“3.206015876763340″,””,10)
    primes[254]=1609;logs[primes[254],”log”]=.toval(“3.206556044099030″,””,10)
    primes[255]=1613;logs[primes[255],”log”]=.toval(“3.207634367388960″,””,10)
    primes[256]=1619;logs[primes[256],”log”]=.toval(“3.209246848753370″,””,10)
    primes[257]=1621;logs[primes[257],”log”]=.toval(“3.209783014848520″,””,10)
    primes[258]=1627;logs[primes[258],”log”]=.toval(“3.211387552936860″,””,10)
    primes[259]=1637;logs[primes[259],”log”]=.toval(“3.214048679411940″,””,10)
    primes[260]=1657;logs[primes[260],”log”]=.toval(“3.219322508419340″,””,10)
    primes[261]=1663;logs[primes[261],”log”]=.toval(“3.220892249219520″,””,10)
    primes[262]=1667;logs[primes[262],”log”]=.toval(“3.221935599828010″,””,10)
    primes[263]=1669;logs[primes[263],”log”]=.toval(“3.222456336679250″,””,10)
    primes[264]=1693;logs[primes[264],”log”]=.toval(“3.228656958108940″,””,10)
    primes[265]=1697;logs[primes[265],”log”]=.toval(“3.229681842317680″,””,10)
    primes[266]=1699;logs[primes[266],”log”]=.toval(“3.230193378869050″,””,10)
    primes[267]=1709;logs[primes[267],”log”]=.toval(“3.232742062720740″,””,10)
    primes[268]=1721;logs[primes[268],”log”]=.toval(“3.235780870327560″,””,10)
    primes[269]=1723;logs[primes[269],”log”]=.toval(“3.236285277448030″,””,10)
    primes[270]=1733;logs[primes[270],”log”]=.toval(“3.238798562713920″,””,10)
    primes[271]=1741;logs[primes[271],”log”]=.toval(“3.240798771117330″,””,10)
    primes[272]=1747;logs[primes[272],”log”]=.toval(“3.242292904982930″,””,10)
    primes[273]=1753;logs[primes[273],”log”]=.toval(“3.243781916093800″,””,10)
    primes[274]=1759;logs[primes[274],”log”]=.toval(“3.245265839457460″,””,10)
    primes[275]=1777;logs[primes[275],”log”]=.toval(“3.249687427805300″,””,10)
    primes[276]=1783;logs[primes[276],”log”]=.toval(“3.251151343175350″,””,10)
    primes[277]=1787;logs[primes[277],”log”]=.toval(“3.252124552505640″,””,10)
    primes[278]=1789;logs[primes[278],”log”]=.toval(“3.252610340567370″,””,10)
    primes[279]=1801;logs[primes[279],”log”]=.toval(“3.255513712819530″,””,10)
    primes[280]=1811;logs[primes[280],”log”]=.toval(“3.257918450314060″,””,10)
    primes[281]=1823;logs[primes[281],”log”]=.toval(“3.260786668654980″,””,10)
    primes[282]=1831;logs[primes[282],”log”]=.toval(“3.262688344301700″,””,10)
    primes[283]=1847;logs[primes[283],”log”]=.toval(“3.266466895440240″,””,10)
    primes[284]=1861;logs[primes[284],”log”]=.toval(“3.269746373130770″,””,10)
    primes[285]=1867;logs[primes[285],”log”]=.toval(“3.271144317949080″,””,10)
    primes[286]=1871;logs[primes[286],”log”]=.toval(“3.272073787500010″,””,10)
    primes[287]=1873;logs[primes[287],”log”]=.toval(“3.272537777375240″,””,10)
    primes[288]=1877;logs[primes[288],”log”]=.toval(“3.273464272621350″,””,10)
    primes[289]=1879;logs[primes[289],”log”]=.toval(“3.273926780100530″,””,10)
    primes[290]=1889;logs[primes[290],”log”]=.toval(“3.276231957921830″,””,10)
    primes[291]=1901;logs[primes[291],”log”]=.toval(“3.278982116865440″,””,10)
    primes[292]=1907;logs[primes[292],”log”]=.toval(“3.280350693046010″,””,10)
    primes[293]=1913;logs[primes[293],”log”]=.toval(“3.281714970027300″,””,10)
    primes[294]=1931;logs[primes[294],”log”]=.toval(“3.285782273779400″,””,10)
    primes[295]=1933;logs[primes[295],”log”]=.toval(“3.286231854028550″,””,10)
    primes[296]=1949;logs[primes[296],”log”]=.toval(“3.289811839117620″,””,10)
    primes[297]=1951;logs[primes[297],”log”]=.toval(“3.290257269394520″,””,10)
    primes[298]=1973;logs[primes[298],”log”]=.toval(“3.295127085252190″,””,10)
    primes[299]=1979;logs[primes[299],”log”]=.toval(“3.296445794206400″,””,10)
    primes[300]=1987;logs[primes[300],”log”]=.toval(“3.298197867109820″,””,10)
    primes[301]=1993;logs[primes[301],”log”]=.toval(“3.299507298700490″,””,10)
    primes[302]=1997;logs[primes[302],”log”]=.toval(“3.300378064870700″,””,10)
    primes[303]=1999;logs[primes[303],”log”]=.toval(“3.300812794118120″,””,10)
    primes[304]=2003;logs[primes[304],”log”]=.toval(“3.301680949293580″,””,10)
    primes[305]=2011;logs[primes[305],”log”]=.toval(“3.303412070596740″,””,10)
    primes[306]=2017;logs[primes[306],”log”]=.toval(“3.304705898212770″,””,10)
    primes[307]=2027;logs[primes[307],”log”]=.toval(“3.306853748693010″,””,10)
    primes[308]=2029;logs[primes[308],”log”]=.toval(“3.307282047033350″,””,10)
    primes[309]=2039;logs[primes[309],”log”]=.toval(“3.309417225778140″,””,10)
    primes[310]=2053;logs[primes[310],”log”]=.toval(“3.312388949370590″,””,10)
    primes[311]=2063;logs[primes[311],”log”]=.toval(“3.314499227973150″,””,10)
    primes[312]=2069;logs[primes[312],”log”]=.toval(“3.315760490665740″,””,10)
    primes[313]=2081;logs[primes[313],”log”]=.toval(“3.318272080211630″,””,10)
    primes[314]=2083;logs[primes[314],”log”]=.toval(“3.318689269947750″,””,10)
    primes[315]=2087;logs[primes[315],”log”]=.toval(“3.319522449065450″,””,10)
    primes[316]=2089;logs[primes[316],”log”]=.toval(“3.319938439980310″,””,10)
    primes[317]=2099;logs[primes[317],”log”]=.toval(“3.322012438582400″,””,10)
    primes[318]=2111;logs[primes[318],”log”]=.toval(“3.324488233307660″,””,10)
    primes[319]=2113;logs[primes[319],”log”]=.toval(“3.324899497052310″,””,10)
    primes[320]=2129;logs[primes[320],”log”]=.toval(“3.328175661438320″,””,10)
    primes[321]=2131;logs[primes[321],”log”]=.toval(“3.328583449714200″,””,10)
    primes[322]=2137;logs[primes[322],”log”]=.toval(“3.329804522164070″,””,10)
    primes[323]=2141;logs[primes[323],”log”]=.toval(“3.330616667294440″,””,10)
    primes[324]=2143;logs[primes[324],”log”]=.toval(“3.331022171041830″,””,10)
    primes[325]=2153;logs[primes[325],”log”]=.toval(“3.333044029823490″,””,10)
    primes[326]=2161;logs[primes[326],”log”]=.toval(“3.334654766883240″,””,10)
    primes[327]=2179;logs[primes[327],”log”]=.toval(“3.338257230246260″,””,10)
    primes[328]=2203;logs[primes[328],”log”]=.toval(“3.343014497150770″,””,10)
    primes[329]=2207;logs[primes[329],”log”]=.toval(“3.343802333161660″,””,10)
    primes[330]=2213;logs[primes[330],”log”]=.toval(“3.344981413927260″,””,10)
    primes[331]=2221;logs[primes[331],”log”]=.toval(“3.346548558548470″,””,10)
    primes[332]=2237;logs[primes[332],”log”]=.toval(“3.349665984096630″,””,10)
    primes[333]=2239;logs[primes[333],”log”]=.toval(“3.350054093579030″,””,10)
    primes[334]=2243;logs[primes[334],”log”]=.toval(“3.350829273582970″,””,10)
    primes[335]=2251;logs[primes[335],”log”]=.toval(“3.352375495000520″,””,10)
    primes[336]=2267;logs[primes[336],”log”]=.toval(“3.355451520126520″,””,10)
    primes[337]=2269;logs[primes[337],”log”]=.toval(“3.355834495884940″,””,10)
    primes[338]=2273;logs[primes[338],”log”]=.toval(“3.356599435724970″,””,10)
    primes[339]=2281;logs[primes[339],”log”]=.toval(“3.358125285276650″,””,10)
    primes[340]=2287;logs[primes[340],”log”]=.toval(“3.359266164606750″,””,10)
    primes[341]=2293;logs[primes[341],”log”]=.toval(“3.360404054729940″,””,10)
    primes[342]=2297;logs[primes[342],”log”]=.toval(“3.361160995195030″,””,10)
    primes[343]=2309;logs[primes[343],”log”]=.toval(“3.363423932917180″,””,10)
    primes[344]=2311;logs[primes[344],”log”]=.toval(“3.363799945479110″,””,10)
    primes[345]=2333;logs[primes[345],”log”]=.toval(“3.367914738793750″,””,10)
    primes[346]=2339;logs[primes[346],”log”]=.toval(“3.369030221809150″,””,10)
    primes[347]=2341;logs[primes[347],”log”]=.toval(“3.369401413696620″,””,10)
    primes[348]=2347;logs[primes[348],”log”]=.toval(“3.370513089598590″,””,10)
    primes[349]=2351;logs[primes[349],”log”]=.toval(“3.371252629124940″,””,10)
    primes[350]=2357;logs[primes[350],”log”]=.toval(“3.372359582524320″,””,10)
    primes[351]=2371;logs[primes[351],”log”]=.toval(“3.374931553978190″,””,10)
    primes[352]=2377;logs[primes[352],”log”]=.toval(“3.376029181728180″,””,10)
    primes[353]=2381;logs[primes[353],”log”]=.toval(“3.376759395404880″,””,10)
    primes[354]=2383;logs[primes[354],”log”]=.toval(“3.377124042346460″,””,10)
    primes[355]=2389;logs[primes[355],”log”]=.toval(“3.378216149749880″,””,10)
    primes[356]=2393;logs[primes[356],”log”]=.toval(“3.378942698613440″,””,10)
    primes[357]=2399;logs[primes[357],”log”]=.toval(“3.380030247967830″,””,10)
    primes[358]=2411;logs[primes[358],”log”]=.toval(“3.382197210377450″,””,10)
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    primes[550]=3989;logs[primes[550],”log”]=.toval(“3.600864036309840″,””,10)
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    primes[553]=4007;logs[primes[553],”log”]=.toval(“3.602819342432700″,””,10)
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    primes[555]=4019;logs[primes[555],”log”]=.toval(“3.604118006192040″,””,10)
    primes[556]=4021;logs[primes[556],”log”]=.toval(“3.604334073102910″,””,10)
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    primes[790]=6053;logs[primes[790],”log”]=.toval(“3.781970673912550″,””,10)
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    primes[807]=6203;logs[primes[807],”log”]=.toval(“3.792601781164970″,””,10)
    primes[808]=6211;logs[primes[808],”log”]=.toval(“3.793161529245550″,””,10)
    primes[809]=6217;logs[primes[809],”log”]=.toval(“3.793580867368160″,””,10)
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    primes[821]=6311;logs[primes[821],”log”]=.toval(“3.800098180174780″,””,10)
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    primes[947]=7481;logs[primes[947],”log”]=.toval(“3.873959654743350″,””,10)
    primes[948]=7487;logs[primes[948],”log”]=.toval(“3.874307833128040″,””,10)
    primes[949]=7489;logs[primes[949],”log”]=.toval(“3.874423830586500″,””,10)
    primes[950]=7499;logs[primes[950],”log”]=.toval(“3.875003353600040″,””,10)
    primes[951]=7507;logs[primes[951],”log”]=.toval(“3.875466415866390″,””,10)
    primes[952]=7517;logs[primes[952],”log”]=.toval(“3.876044550246100″,””,10)
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    primes[1001]=7927;logs[primes[1001],”log”]=.toval(“3.899108858193400″,””,10)
    primes[1002]=7933;logs[primes[1002],”log”]=.toval(“3.899437454286180″,””,10)
    primes[1003]=7937;logs[primes[1003],”log”]=.toval(“3.899656380305640″,””,10)
    primes[1004]=7949;logs[primes[1004],”log”]=.toval(“3.900312496983730″,””,10)
    primes[1005]=7951;logs[primes[1005],”log”]=.toval(“3.900421753457740″,””,10)
    primes[1006]=7963;logs[primes[1006],”log”]=.toval(“3.901076715726260″,””,10)
    primes[1007]=7993;logs[primes[1007],”log”]=.toval(“3.902709812969880″,””,10)
    primes[1008]=8009;logs[primes[1008],”log”]=.toval(“3.903578293663050″,””,10)
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    primes[1116]=8971;logs[primes[1116],”log”]=.toval(“3.952840856675700″,””,10)
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    primes[1118]=9001;logs[primes[1118],”log”]=.toval(“3.954290761701130″,””,10)
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    primes[1121]=9013;logs[primes[1121],”log”]=.toval(“3.954869371066480″,””,10)
    primes[1122]=9029;logs[primes[1122],”log”]=.toval(“3.955639653023250″,””,10)
    primes[1123]=9041;logs[primes[1123],”log”]=.toval(“3.956216469243390″,””,10)
    primes[1124]=9043;logs[primes[1124],”log”]=.toval(“3.956312530841200″,””,10)
    primes[1125]=9049;logs[primes[1125],”log”]=.toval(“3.956600588213180″,””,10)
    primes[1126]=9059;logs[primes[1126],”log”]=.toval(“3.957080259657900″,””,10)
    primes[1127]=9067;logs[primes[1127],”log”]=.toval(“3.957463615729930″,””,10)
    primes[1128]=9091;logs[primes[1128],”log”]=.toval(“3.958611657764880″,””,10)
    primes[1129]=9103;logs[primes[1129],”log”]=.toval(“3.959184542731190″,””,10)
    primes[1130]=9109;logs[primes[1130],”log”]=.toval(“3.959470702075110″,””,10)
    primes[1131]=9127;logs[primes[1131],”log”]=.toval(“3.960328050530140″,””,10)
    primes[1132]=9133;logs[primes[1132],”log”]=.toval(“3.960613457647910″,””,10)
    primes[1133]=9137;logs[primes[1133],”log”]=.toval(“3.960803624911770″,””,10)
    primes[1134]=9151;logs[primes[1134],”log”]=.toval(“3.961468555350790″,””,10)
    primes[1135]=9157;logs[primes[1135],”log”]=.toval(“3.961753214186780″,””,10)
    primes[1136]=9161;logs[primes[1136],”log”]=.toval(“3.961942883141390″,””,10)
    primes[1137]=9173;logs[primes[1137],”log”]=.toval(“3.962511393507600″,””,10)
    primes[1138]=9181;logs[primes[1138],”log”]=.toval(“3.962889987391790″,””,10)
    primes[1139]=9187;logs[primes[1139],”log”]=.toval(“3.963173716375250″,””,10)
    primes[1140]=9199;logs[primes[1140],”log”]=.toval(“3.963740618857880″,””,10)
    primes[1141]=9203;logs[primes[1141],”log”]=.toval(“3.963929422026560″,””,10)
    primes[1142]=9209;logs[primes[1142],”log”]=.toval(“3.964212472969820″,””,10)
    primes[1143]=9221;logs[primes[1143],”log”]=.toval(“3.964778022022380″,””,10)
    primes[1144]=9227;logs[primes[1144],”log”]=.toval(“3.965060520611200″,””,10)
    primes[1145]=9239;logs[primes[1145],”log”]=.toval(“3.965624967109240″,””,10)
    primes[1146]=9241;logs[primes[1146],”log”]=.toval(“3.965718970244220″,””,10)
    primes[1147]=9257;logs[primes[1147],”log”]=.toval(“3.966470263729280″,””,10)
    primes[1148]=9277;logs[primes[1148],”log”]=.toval(“3.967407556597470″,””,10)
    primes[1149]=9281;logs[primes[1149],”log”]=.toval(“3.967594772671890″,””,10)
    primes[1150]=9283;logs[primes[1150],”log”]=.toval(“3.967688350453310″,””,10)
    primes[1151]=9293;logs[primes[1151],”log”]=.toval(“3.968155937149970″,””,10)
    primes[1152]=9311;logs[primes[1152],”log”]=.toval(“3.968996326648310″,””,10)
    primes[1153]=9319;logs[primes[1153],”log”]=.toval(“3.969369311733530″,””,10)
    primes[1154]=9323;logs[primes[1154],”log”]=.toval(“3.969555684220840″,””,10)
    primes[1155]=9337;logs[primes[1155],”log”]=.toval(“3.970207358806860″,””,10)
    primes[1156]=9341;logs[primes[1156],”log”]=.toval(“3.970393372079600″,””,10)
    primes[1157]=9343;logs[primes[1157],”log”]=.toval(“3.970486348847650″,””,10)
    primes[1158]=9349;logs[primes[1158],”log”]=.toval(“3.970765159780770″,””,10)
    primes[1159]=9371;logs[primes[1159],”log”]=.toval(“3.971785937879110″,””,10)
    primes[1160]=9377;logs[primes[1160],”log”]=.toval(“3.972063916008020″,””,10)
    primes[1161]=9391;logs[primes[1161],”log”]=.toval(“3.972711840547070″,””,10)
    primes[1162]=9397;logs[primes[1162],”log”]=.toval(“3.972989226855350″,””,10)
    primes[1163]=9403;logs[primes[1163],”log”]=.toval(“3.973266436108530″,””,10)
    primes[1164]=9413;logs[primes[1164],”log”]=.toval(“3.973728058688030″,””,10)
    primes[1165]=9419;logs[primes[1165],”log”]=.toval(“3.974004796897420″,””,10)
    primes[1166]=9421;logs[primes[1166],”log”]=.toval(“3.974097003794130″,””,10)
    primes[1167]=9431;logs[primes[1167],”log”]=.toval(“3.974557744853580″,””,10)
    primes[1168]=9433;logs[primes[1168],”log”]=.toval(“3.974649834438720″,””,10)
    primes[1169]=9437;logs[primes[1169],”log”]=.toval(“3.974833955048540″,””,10)
    primes[1170]=9439;logs[primes[1170],”log”]=.toval(“3.974925986089760″,””,10)
    primes[1171]=9461;logs[primes[1171],”log”]=.toval(“3.975937042483110″,””,10)
    primes[1172]=9463;logs[primes[1172],”log”]=.toval(“3.976028840091130″,””,10)
    primes[1173]=9467;logs[primes[1173],”log”]=.toval(“3.976212377117380″,””,10)
    primes[1174]=9473;logs[primes[1174],”log”]=.toval(“3.976487537305190″,””,10)
    primes[1175]=9479;logs[primes[1175],”log”]=.toval(“3.976762523267460″,””,10)
    primes[1176]=9491;logs[primes[1176],”log”]=.toval(“3.977311973396930″,””,10)
    primes[1177]=9497;logs[primes[1177],”log”]=.toval(“3.977586438003850″,””,10)
    primes[1178]=9511;logs[primes[1178],”log”]=.toval(“3.978226181674530″,””,10)
    primes[1179]=9521;logs[primes[1179],”log”]=.toval(“3.978682565156940″,””,10)
    primes[1180]=9533;logs[primes[1180],”log”]=.toval(“3.979229593022160″,””,10)
    primes[1181]=9539;logs[primes[1181],”log”]=.toval(“3.979502848787400″,””,10)
    primes[1182]=9547;logs[primes[1182],”log”]=.toval(“3.979866922564900″,””,10)
    primes[1183]=9551;logs[primes[1183],”log”]=.toval(“3.980048845064960″,””,10)
    primes[1184]=9587;logs[primes[1184],”log”]=.toval(“3.981682727371290″,””,10)
    primes[1185]=9601;logs[primes[1185],”log”]=.toval(“3.982316469692070″,””,10)
    primes[1186]=9613;logs[primes[1186],”log”]=.toval(“3.982858942312080″,””,10)
    primes[1187]=9619;logs[primes[1187],”log”]=.toval(“3.983129924734700″,””,10)
    primes[1188]=9623;logs[primes[1188],”log”]=.toval(“3.983310485794120″,””,10)
    primes[1189]=9629;logs[primes[1189],”log”]=.toval(“3.983581186705790″,””,10)
    primes[1190]=9631;logs[primes[1190],”log”]=.toval(“3.983671382860200″,””,10)
    primes[1191]=9643;logs[primes[1191],”log”]=.toval(“3.984212166761430″,””,10)
    primes[1192]=9649;logs[primes[1192],”log”]=.toval(“3.984482306402260″,””,10)
    primes[1193]=9661;logs[primes[1193],”log”]=.toval(“3.985022082109540″,””,10)
    primes[1194]=9677;logs[primes[1194],”log”]=.toval(“3.985740741050070″,””,10)
    primes[1195]=9679;logs[primes[1195],”log”]=.toval(“3.985830489858390″,””,10)
    primes[1196]=9689;logs[primes[1196],”log”]=.toval(“3.986278955905990″,””,10)
    primes[1197]=9697;logs[primes[1197],”log”]=.toval(“3.986637395610150″,””,10)
    primes[1198]=9719;logs[primes[1198],”log”]=.toval(“3.987621582125480″,””,10)
    primes[1199]=9721;logs[primes[1199],”log”]=.toval(“3.987710943130310″,””,10)
    primes[1200]=9733;logs[primes[1200],”log”]=.toval(“3.988246723375380″,””,10)
    primes[1201]=9739;logs[primes[1201],”log”]=.toval(“3.988514365833670″,””,10)
    primes[1202]=9743;logs[primes[1202],”log”]=.toval(“3.988692702549820″,””,10)
    primes[1203]=9749;logs[primes[1203],”log”]=.toval(“3.988960070390340″,””,10)
    primes[1204]=9767;logs[primes[1204],”log”]=.toval(“3.989761187718780″,””,10)
    primes[1205]=9769;logs[primes[1205],”log”]=.toval(“3.989850109603180″,””,10)
    primes[1206]=9781;logs[primes[1206],”log”]=.toval(“3.990383258906230″,””,10)
    primes[1207]=9787;logs[primes[1207],”log”]=.toval(“3.990649588318850″,””,10)
    primes[1208]=9791;logs[primes[1208],”log”]=.toval(“3.990827050567480″,””,10)
    primes[1209]=9803;logs[primes[1209],”log”]=.toval(“3.991359002637950″,””,10)
    primes[1210]=9811;logs[primes[1210],”log”]=.toval(“3.991713275713090″,””,10)
    primes[1211]=9817;logs[primes[1211],”log”]=.toval(“3.991978790994580″,””,10)
    primes[1212]=9829;logs[primes[1212],”log”]=.toval(“3.992509335067780″,””,10)
    primes[1213]=9833;logs[primes[1213],”log”]=.toval(“3.992686039162130″,””,10)
    primes[1214]=9839;logs[primes[1214],”log”]=.toval(“3.992950960570450″,””,10)
    primes[1215]=9851;logs[primes[1215],”log”]=.toval(“3.993480319070000″,””,10)
    primes[1216]=9857;logs[primes[1216],”log”]=.toval(“3.993744756554460″,””,10)
    primes[1217]=9859;logs[primes[1217],”log”]=.toval(“3.993832866613990″,””,10)
    primes[1218]=9871;logs[primes[1218],”log”]=.toval(“3.994361151908000″,””,10)
    primes[1219]=9883;logs[primes[1219],”log”]=.toval(“3.994888795364910″,””,10)
    primes[1220]=9887;logs[primes[1220],”log”]=.toval(“3.995064534156140″,””,10)
    primes[1221]=9901;logs[primes[1221],”log”]=.toval(“3.995679060511620″,””,10)
    primes[1222]=9907;logs[primes[1222],”log”]=.toval(“3.995942162992550″,””,10)
    primes[1223]=9923;logs[primes[1223],”log”]=.toval(“3.996642991355470″,””,10)
    primes[1224]=9929;logs[primes[1224],”log”]=.toval(“3.996905510695670″,””,10)
    primes[1225]=9931;logs[primes[1225],”log”]=.toval(“3.996992981890710″,””,10)
    primes[1226]=9941;logs[primes[1226],”log”]=.toval(“3.997430073797470″,””,10)
    primes[1227]=9949;logs[primes[1227],”log”]=.toval(“3.997779430865600″,””,10)
    primes[1228]=9967;logs[primes[1228],”log”]=.toval(“3.998564458260940″,””,10)
    primes[1229]=9973;logs[primes[1229],”log”]=.toval(“3.998825819040290″,””,10)
    end function

    //*************************************************
    //* Kromkowski log really slow
    //*************************************************

    function main()
    number n
    number eval
    number denom
    number y
    number log
    integer i
    integer icount;// precision
    integer testy
    string sResult
    integer test
    array digits
    digits=@ array.new()

    integer e
    e = 0
    string message,title
    anyvalue prompt
    message = “Entry a number.”
    title = “log test”
    prompt = “”
    n = .toval(getuserinput(message,title,prompt, error =e),””,10)

    integer d
    i=0
    icount=4
    eval = n
    while i < icount
    d=.len(.tostr(INT(eval),10)) – 1
    digits=d
    y=eval/raisetopower(10,d)
    eval=raisetopower(y,10)
    i=i + 1
    end while

    i=0
    log=0
    while i < icount
    denom=raisetopower(10,i)
    testy=digits
    log=log + testy/denom
    i=i +1
    end while

    sResult=.tostr(.fix(log,raisetopower(10,icount)),10)

    end function “The log of ” + .tostr(n,10) + ” is:{d}{a}” + sResult

    ***********************************************
    Not mine and I can’t quite figure out the C

    //int fxlog(int x) {
    //int t,y;
    //
    // y=0xa65af;
    // if(x<0x00008000) x<<=16, y-=0xb1721;
    // if(x<0x00800000) x<<= 8, y-=0x58b91;
    // if(x<0x08000000) x<<= 4, y-=0x2c5c8;
    // if(x<0x20000000) x<<= 2, y-=0x162e4;
    // if(x<0x40000000) x<<= 1, y-=0x0b172;
    // t=x+(x>>1); if((t&0x80000000)==0) x=t,y-=0x067cd;
    // t=x+(x>>2); if((t&0x80000000)==0) x=t,y-=0x03920;
    // t=x+(x>>3); if((t&0x80000000)==0) x=t,y-=0x01e27;
    // t=x+(x>>4); if((t&0x80000000)==0) x=t,y-=0x00f85;
    // t=x+(x>>5); if((t&0x80000000)==0) x=t,y-=0x007e1;
    // t=x+(x>>6); if((t&0x80000000)==0) x=t,y-=0x003f8;
    // t=x+(x>>7); if((t&0x80000000)==0) x=t,y-=0x001fe;
    // x=0x80000000-x;
    // y-=x>>15;
    // return y;
    //}

    ///* input x is a 0.16 fixed-point number in [0,1)
    // function returns -log2(x) as a 5.16 fixed-point number in (0, 16]
    //*/
    //uint32_t nlog2_16 (uint16_t x)
    //{
    // uint32_t r = 0;
    // uint32_t t, a = x;
    //
    // /* try factors 2**i with i = 8, 4, 2, 1 */
    // if ((t = a << 8 ) < 0x10000) { a = t; r += 0x80000; }
    // if ((t = a << 4 ) < 0x10000) { a = t; r += 0x40000; }
    // if ((t = a << 2 ) < 0x10000) { a = t; r += 0x20000; }
    // if ((t = a << 1 ) < 0x10000) { a = t; r += 0x10000; }
    // /* try factors (1+2**(-i)) with i = 1, .., 16 */
    // if ((t = a + (a >> 1)) < 0x10000) { a = t; r += 0x095c0; }
    // if ((t = a + (a >> 2)) < 0x10000) { a = t; r += 0x0526a; }
    // if ((t = a + (a >> 3)) < 0x10000) { a = t; r += 0x02b80; }
    // if ((t = a + (a >> 4)) < 0x10000) { a = t; r += 0x01664; }
    // if ((t = a + (a >> 5)) < 0x10000) { a = t; r += 0x00b5d; }
    // if ((t = a + (a >> 6)) < 0x10000) { a = t; r += 0x005ba; }
    // if ((t = a + (a >> 7)) < 0x10000) { a = t; r += 0x002e0; }
    // if ((t = a + (a >> 8)) < 0x10000) { a = t; r += 0x00171; }
    // if ((t = a + (a >> 9)) < 0x10000) { a = t; r += 0x000b8; }
    // if ((t = a + (a >> 10)) < 0x10000) { a = t; r += 0x0005c; }
    // if ((t = a + (a >> 11)) < 0x10000) { a = t; r += 0x0002e; }
    // if ((t = a + (a >> 12)) < 0x10000) { a = t; r += 0x00017; }
    // if ((t = a + (a >> 13)) < 0x10000) { a = t; r += 0x0000c; }
    // if ((t = a + (a >> 14)) < 0x10000) { a = t; r += 0x00006; }
    // if ((t = a + (a >> 15)) < 0x10000) { a = t; r += 0x00003; }
    // if ((t = a + (a >> 16)) < 0x10000) { a = t; r += 0x00001; }
    // return r;
    //}

    // /* Compute floor(log(u)/log(1-p)) for 0 < u < 1 and 0 < p < 1,
    // where ‘u’ and ‘p’ are represented as 0.16 fixed-point numbers
    // Result is an integer in range [0, 1048676]
    //*/
    //uint32_t func (uint16_t u, uint16_t p)
    //{
    // uint16_t one_minus_p = 0x10000 – p; // 1.0 – p
    // uint32_t log_u = nlog2_16 (u);
    // uint32_t log_p = nlog2_16 (one_minus_p);
    // uint32_t res = log_u / log_p; // divide and floor in one go
    // return res;
    //}

    #3523
    JD Kromkowski
    Participant

    // Ok ish for smaller numbers like under 15,
    // you could increase iterations but then things could get pretty slow
    // maybe dividing by 2 and using log(ab) = log(a) + log(b)
    // this would be a good way to learn how multi threading actually works in SBNG
    // eg, working on a and b in separate threads
    // http://www.machinedlearnings.com/2011/06/fast-approximate-logarithm-exponential.html wish my C was
    // better

    constant ln10 “2.30258509299”

    function main()
    integer i
    number n
    number ans10
    integer e
    e = 0
    i = 3
    string message,title
    anyvalue prompt
    message = “Entry a number.”
    title = “log test”
    prompt = “”
    n = .toval(getuserinput(message,title,prompt, error =e),””,10)
    number x
    x = (n-1)/(n+1);
    number sum

    sum = x
    while i <= 151
    sum = sum + raisetopower(x,i)/i
    i = i + 2
    end while
    sum = sum * 2

    ans10 = sum/.toval(ln10,””,10)
    end function .tostr(.fix(sum,100000000000),10) + ” is natural log ln of ” + .tostr(n,10) + “{d}{a}” + .tostr(.fix(ans10,100000000000),10) + ” is common log (log10) of ” + .tostr(n,10)

    #3540
    JD Kromkowski
    Participant

    //Maybe a better way to do logs base 10 that is “reasonably accurate” and doesn’t take too long
    //c John David Kromkowski 2017 free to use just attribute
    //Once I adjusted for crap results less that < 5, with a shift: I think there is even better way.

    constant log10_2 “0.30102999566398119521373889472449”

    function main()
    number n
    number log
    log = 0
    integer e
    e = 0
    string message,title
    anyvalue prompt
    message = “Entry a number.”
    title = “log test”
    prompt = “”
    n = .toval(getuserinput(message,title,prompt, error =e),””,10)
    log = jdk_log(n)
    end function .tostr(log,10)

    function jdk_log(number n)
    number log,log10,log3
    number eval, shift
    integer p
    p = 0
    eval = n
    shift = 0
    if n < 1/2
    eval = eval * 100
    shift = 2
    end if

    while eval > 1
    eval = eval/2
    p = p +1
    end while
    number x, x2, x3,x4, x5, x6, x7, x8, x9, x10
    number test10, test3
    x = eval
    x2 = x * x
    x3 = x2 * x
    x4 = x3 * x
    x5 = x4 * x
    x6 = x5 * x
    x7 = x6 * x
    x8 = x7 * x
    x9 = x8 * x
    x10 = x9 * x

    test10 = -(1436/1000)
    test10 = test10 + (5541/1000 * x)
    test10 = test10 – (12204/1000 * x2)
    test10 = test10 + (13987/1000 * x3)
    test10 = test10 + (0304/1000 * x4)
    test10 = test10 – (17075/1000 * x5)
    test10 = test10 + (4459/1000 * x6)
    test10 = test10 + (30204/1000 * x7)
    test10 = test10 – (42185/1000 * x8)
    test10 = test10 + (23255/1000 * x9)
    test10 = test10 – (4849/1000 * x10)

    test3 = -(944/1000)
    test3 = test3 + (1814/1000 * x)
    test3 = test3 – (1241/1000 * x2)
    test3 = test3 + (371/1000 * x3)

    log10 = p * .toval(log10_2,””,10) + round(test10,1/1000000) – shift
    log3 = p * .toval(log10_2,””,10) + round(test3,1/1000000) – shift
    log = round((log10 + log3 )/2,1/10000)
    end function log

    #3542
    JD Kromkowski
    Participant

    // This is even better,
    //c John David Kromkowski 2017 free to use just attribute

    function main()
    string message,title
    anyvalue prompt
    number X, log
    integer e
    e = 0
    message = “Entry a number.”
    title = “log test”
    prompt = “”
    X = .toval(getuserinput(message,title,prompt, error =e),””,10)
    log = jdk_log(X)
    end function log

    function jdk_log(number X)
    number k, p, n
    p = 1
    k = 10
    // k is really any base
    n = 0
    if X < 1
    X = X * 100
    n = -2
    end if
    while X > k
    X = X/k
    n = n+1
    end while
    while
    k = sqrt(k,14)
    p = p/2
    while X > k
    X = X/k
    n = n+p
    end while
    end while p < 1/100000000000000

    end function round(n,1/100000000000000)

    #3543
    Michael
    Keymaster

    John,

    Interesting work. I haven’t needed to use logarithms in any of my recent work, which is probably why I hadn’t chased this issue myself.

    Good job!

    Neil

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