v?expm1

Subtract 1 from the base-e exponential of an input vector.

Interface Definition

C interface:

void vsexpm1(const int len, const float* src, float* dst);

void vdexpm1(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 vsexpm1 Double-precision floating-point type for vdexpm1	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 vsexpm1 Double-precision floating-point type for vdexpm1	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 vsexpm1
Double-precision floating-point type for vdexpm1

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 vsexpm1
Double-precision floating-point type for vdexpm1

Output vector dst with length len.

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

Output

Return Value

Return the result of $\text{[math]}$ . For special values, see the following table.

Input Value (src)	Output Value (dst)
+0	+0
-0	-0
>overflow	+inf
inf	inf
-inf	-1
nan	nan

Dependencies

C: "kvml.h"

Examples

C interface:

    int i, len = 4; 
    float src[len] = {0.0f, INFINITY, NAN, 2.0f}; 
    float* dst = (float*)malloc(sizeof(float) * len); 
    if (dst == NULL) { 
        printf("Malloc Failed!\n"); 
        return 0; 
    } 
    vsexpm1(len, src, dst); 
    /** 
     *  Output dst: 
     *     -1.0  inf  nan  6.38905609893065
     * 
     */

Parent topic: Function Syntax