Computes a natural logarithm of vector elements that are increased by 1.

Syntax

vsLog1p( n, a, y );

vmsLog1p( n, a, y, mode );

vdLog1p( n, a, y );

vmdLog1p( n, a, y, 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 vsLog1p, vmsLog1p

const double* for vdLog1p, vmdLog1p

Pointer to an array that contains the input vector a.

mode

const MKL_INT64

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

Output Parameters

Name

Type

Description

y

float* for vsLog1p, vmsLog1p

double* for vdLog1p, vmdLog1p

Pointer to an array that contains the output vector y.

Description

The v?Log1p function computes a natural logarithm of vector elements that are increased by 1.

Special Values for Real Function v?Log1p(x)
Argument Result VM Error Status Exception
-1 - VML_STATUS_SING ZERODIVIDE
X < -1 QNAN VML_STATUS_ERRDOM INVALID
+0 +0    
-0 -0    
- QNAN VML_STATUS_ERRDOM INVALID
+ +    
QNAN QNAN    
SNAN QNAN   INVALID
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