Java Utililty Methods Gamma

double gamma(double x)
gamma

double g = 1.0;
double f;
if (x > 0.0) {
 while (x < 3.0) {
 g *= x;
 ++x;
 f = (1.0 - 2.0 / (7.0 * Math.pow(x, 2.0)) * (1.0 - 2.0 / (3.0 * Math.pow(x, 2.0))))
...

double gamma(double x)
This function computes the gamme function gamma(x)

return Math.exp(logGamma(x));

double gamma(double x)
gamma

double xcopy = x;
double first = x + lgfGamma + 0.5;
double second = lgfCoeff[0];
double fg = 0.0D;
if (x >= 0.0) {
 if (x >= 1.0D && x - (int) x == 0.0D) {
 fg = factorial((int) x) / x;
 } else {
...

double gamma(double x)
Returns the Gamma function of a double.

double ans;
double y = Math.abs(x);
if (y <= 10.0) {
 int n = (int) x;
 if (x < 0.0)
 n--;
 y = x - n;
 n--;
...

double Gamma(double z)
Gamma

double total = 0.0;
double step = (10 * z) / 1000;
double t = 0;
double r = z - 1;
double last = Math.pow(t, r);
for (t = step; t < 10 * z; t += step) {
 double next = Math.pow(t, r) * Exp(-t);
 total += TrapeziumArea(step, last, next);
...

double gamma(int alpha)
gamma

return factorial(alpha - 1);

int gamma(int rgb)
gamma

return (red(rgb) + green(rgb) + blue(rgb)) / 3;

double gammaCdf(double a, double x)
compute complementary gamma cdf by its continued fraction expansion

double gln ;
if ((x <= 0.0) || (a <= 0.0)) {
 return Double.NaN;
} else if (a > LARGE_A) {
 return gnorm(a, x);
} else {
 gln = lngamma(a);
 if (x < (a + 1.0)) {
...

double gammaCdf(double a, double x)
compute complementary gamma cdf by its continued fraction expansion

double gln ;
if ((x <= 0.0) || (a <= 0.0)) {
 return Double.NaN;
} else if (a > LARGE_A) {
 return gnorm(a, x);
} else {
 gln = lngamma(a);
 if (x < (a + 1.0)) {
...

float gammaCorrection(final float gamma, final float x)
gamma Correction

return (float) Math.pow(x, 1 / gamma);