2.1.16.6.5.3 gammaln

Description

This function returns the natural logarithm of the gamma function.

Syntax

double gammaln( double x )

Parameters

x

[input] the double value

Return

the natural logarithm of the gamma function of x.

Examples

EX1

void    gammaln_ex1()
{
    double        x = 17.;
    double        val = gammaln(x);
    printf("gammaln(%f) = %f\n", x, val);

    double        y = 17;
    double        vy = gamma(y);
    double        vvy = ln(vy);
    printf("val = %.lf, vvy = %.lf\n", val, vvy);
}

Remark

See Also

Header to Include

origin.h

Reference