Developer Reference for Intel® oneAPI Math Kernel Library for Fortran

ID 766686
Date 3/22/2024
Public

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Document Table of Contents

v?Log1p

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

Syntax

call vslog1p( n, a, y )

call vslog1pi(n, a, inca, y, incy)

call vmslog1p( n, a, y, mode )

call vmslog1pi(n, a, inca, y, incy, mode)

call vdlog1p( n, a, y )

call vdlog1pi(n, a, inca, y, incy)

call vmdlog1p( n, a, y, mode )

call vmdlog1pi(n, a, inca, y, incy, mode)

Include Files

  • mkl_vml.f90

Input Parameters

Name

Type

Description

n

INTEGER, INTENT(IN)

Specifies the number of elements to be calculated.

a

DOUBLE PRECISION for vdlog1p, vmdlog1p

REAL, INTENT(IN) for vslog1p, vmslog1p

DOUBLE PRECISION, INTENT(IN) for vdlog1p, vmdlog1p

Array that specifies the input vector a.

inca, incy

INTEGER, INTENT(IN)

Specifies increments for the elements of a and y.

mode

INTEGER(KIND=8), INTENT(IN)

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

Output Parameters

Name

Type

Description

y

DOUBLE PRECISION for vdlog1p, vmdlog1p

REAL, INTENT(OUT) for vslog1p, vmslog1p

DOUBLE PRECISION, INTENT(OUT) for vdlog1p, vmdlog1p

Array that specifies 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