I'm trying to write an extension for Google Sheets to add the CHIDIST() function as in Microsoft Excel and LibreOffice Calc. My current attempt does not produce the same results as the LibreOffice function. Any help would be greatly appreciated.function CHIDIST(value, degrees_of_freedom) {  x = value;  v = degrees_of_freedom;  if(x>0) {    return (Math.pow(x,(v-2)/2)*Math.pow(Math.E,-x/2))/(Math.pow(2,v/2)*gamma(v/2));  }  else {    return 0;  }}function gamma(x){    var p = [0.99999999999980993, 676.5203681218851, -1259.1392167224028,        771.32342877765313, -176.61502916214059, 12.507343278686905,        -0.13857109526572012, 9.9843695780195716e-6, 1.5056327351493116e-7];    var g = 7;    if(x < 0.5){        return Math.PI / (Math.sin(Math.PI * x)*gamma(1-x));    }    x -= 1;    var a = p[0];    var t = x+g+0.5;    for(var i = 1; i < p.length; i++){        a += p[i]/(x+i);    }    return Math.sqrt(2*Math.PI)*Math.pow(t, x+0.5)*Math.exp(-t)*a;}This is the equation that I modeled the program after:
Probability Density Function of a Chi Distribution
google spreadsheets;google apps script