v?log10
Compute the element-wise base-10 logarithm of a vector.
Interface Definition
C interface:
void vslog10(const int len, const float* src, float* dst);
void vdlog10(const int len, const double* src, double* dst);
void vclog10(const int len, const float complex *src, float complex *dst);
void vzlog10(const int len, const double complex *src, double complex *dst);
Fortran interface:
CALL VSLOG10(LEN, SRC, DST);
CALL VDLOG10(LEN, SRC, DST);
Parameters
Parameter |
Type |
Description |
Input/Output |
|---|---|---|---|
len |
Integer |
Number of elements in the input vector. If len ≤ 0, the system displays a message indicating that the value of len is invalid. |
Input |
src |
|
Input vector src with length len. If the pointer is null, the system prompts a null pointer error. |
Input |
dst |
|
Output vector dst with length len. If the pointer is null, the system prompts a null pointer error. |
Output |
Return Value
- Return the result of
. - For vslog10 and vdlog10, special output values are listed in the following table.
Input Value (src)
Output Value (dst)
±0
-inf
<0
nan
+inf
+inf
nan
nan
- For vclog10 and vzlog10, see the special values of libm clog10.
Dependencies
C: "kvml.h"
Fortran: "kvml.f03"
Examples
C interface:
int i, len = 4;
float src[len] = {0.0f, 1.0f, inf, nan};
float* dst = (float*)malloc(sizeof(float) * len);
if (dst == NULL) {
printf("Malloc Failed!\n");
return 0;
}
vslog10(len, src, dst);
/**
* Output dst:
* -inf 0 inf nan
*
*/
Fortran interface:
INTEGER :: LEN = 4
REAL(4) SRC(4)
REAL(4) DST(4)
DATA SRC /1, 2, 3, 4/
CALL VSLOG10(LEN, SRC, DST)
!
! OUTPUT DST:
! 0.00000000, 0.301030010, 0.477121234, 0.602060020
!