Developer Reference

  • 2021.1
  • 12/04/2020
  • Public Content
Contents

v?Log1p

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

Syntax

vsLog1p
(
n
,
a
,
y
)
;
vsLog1pI(n, a, inca, y, incy);
vmsLog1p
(
n
,
a
,
y
,
mode
)
;
vmsLog1pI(n, a, inca, y, incy, mode);
vdLog1p
(
n
,
a
,
y
)
;
vdLog1pI(n, a, inca, y, incy);
vmdLog1p
(
n
,
a
,
y
,
mode
)
;
vmdLog1pI(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
vsLog1p
,
vmsLog1p
const double*
for
vdLog1p
,
vmdLog1p
Pointer to an array that contains the input vector
a
.
inca
,
incy
const MKL_INT
Specifies increments for the elements of
a
and
y
.
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

Product and Performance Information

1

Performance varies by use, configuration and other factors. Learn more at www.Intel.com/PerformanceIndex.