Developer Reference for Intel® oneAPI Math Kernel Library for C

ID 766684
Date 7/13/2023
Public

A newer version of this document is available. Customers should click here to go to the newest version.

Document Table of Contents

v?Log2

Computes the base 2 logarithm of vector elements.

Syntax

vsLog2 (n, a, y);

vsLog2I(n, a, inca, y, incy);

vmsLog2 (n, a, y, mode);

vmsLog2I(n, a, inca, y, incy, mode);

vdLog2 (n, a, y);

vdLog2I(n, a, inca, y, incy);

vmdLog2 (n, a, y, mode);

vmdLog2I(n, a, inca, y, incy, mode);

Include Files

  • mkl.h

Input Parameters

Name

Type

Description

n

const MKL_INT

Specifies the number of elements to be calculated.

a

const float* for vsLog2

const float* for vmsLog2

const double* for vdLog2

const double* for vmdLog2

Pointer to the array containing the input vector a.

inca, incy

const MKL_INT

Specifies increments for the elements of a and y.

mode

const MKL_INT64

Overrides the global VM mode setting for this function call. See vmlSetMode for possible values and their description.

Output Parameters

Name

Type

Description

y

float* for vsLog2

float* for vmsLog2

double* for vdLog2

double* for vmdLog2

Pointer to an array containing the output vector y.

Description

The v?Log2 function computes the base 2 logarithm of vector elements.

See Special Value Notations for the conventions used in this table:

Special values for Real Function v?Log2(x)
Argument Result VM Error Status Exception
+1 +0    
x < +0 QNAN VML_STATUS_ERRDOM INVALID
+0 - VML_STATUS_SING ZERODIVIDE
-0 - VML_STATUS_SING ZERODIVIDE
- QNAN VML_STATUS_ERRDOM INVALID
+ +    
QNAN QNAN    
SNAN QNAN   INVALID

See Also