public static double sumOfLogarithms(double[] elements) {
double logsum = 0;
for (int i = 0; i < elements.length; i++) {
logsum += Math.log(elements[i]);
}
return logsum;
}
public static double logGamma(double xx) {
double[] cof = {
76.18009172947146,
-86.50532032941677,
24.01409824083091,
-1.231739572450155,
0.1208650973866179e-2,
-0.5395239384953e-5
};
double x = xx - 1.0;
double tmp = x + 5.5;
tmp -= (x + 0.5) * Math.log(tmp);
double ser = 1.000000000190015;
double[] coeff = cof;
for (int j = 0; j <= 5; j++) {
x++;
ser += coeff[j] / x;
}
return -tmp + Math.log(2.5066282746310005 * ser);
}