v?lgamma

Compute the natural logarithm of the absolute value of the gamma function for the input vector.

Interface Definition

C interface:

void vslgamma(const int len, const float* src, float* dst);

void vdlgamma(const int len, const double* src, double* dst);

Parameters

Parameter	Type	Description	Input/Output
len	Integer	Number of elements in the input vector. If len ≤ 0, an invalid parameter error is reported and the function returns.	Input
src	Single-precision floating-point type for vslgamma Double-precision floating-point type for vdlgamma	Input vector src with length len. If the pointer is null, a null pointer error is reported and the function returns.	Input
dst	Single-precision floating-point type for vslgamma Double-precision floating-point type for vdlgamma	Output vector dst with length len. If the pointer is null, a null pointer error is reported and the function returns.	Output

Parameter

Type

Description

Input/Output

len

Integer

Number of elements in the input vector.

If len ≤ 0, an invalid parameter error is reported and the function returns.

Input

src

Single-precision floating-point type for vslgamma
Double-precision floating-point type for vdlgamma

Input vector src with length len.

If the pointer is null, a null pointer error is reported and the function returns.

Input

dst

Single-precision floating-point type for vslgamma
Double-precision floating-point type for vdlgamma

Output vector dst with length len.

If the pointer is null, a null pointer error is reported and the function returns.

Output

Return Value

Each operation value returns the natural logarithm of the absolute value of the gamma function for x.
For special values, see the following table.
Input Value (src)

Output Value (dst)

±0

+inf

±inf

+inf

nan

nan

Input Value (src)	Output Value (dst)
±0	+inf
±inf	+inf
nan	nan

Dependencies

C: "kvml.h"

Examples

C interface:

    int i, len = 11; 
    float src[11] = {-100.0f, -1.0f, -0.0f, 0.0f, 0.3f, 0.5f, 1.0f, 100.0f, -INFINITY, INFINITY, NAN}; 
    float* dst = (float*)malloc(sizeof(float) * len); 
    if (dst == NULL) { 
        printf("Malloc Failed!\n"); 
        return 0;
    }
    vslgamma(len, src, dst);

    /** 
     *  Output dst: 
     *     inf inf inf inf 1.095798 0.572365 0.000000 359.134216 inf inf nan
     */

Parent topic: Function Syntax