Developer Reference

  • 2020.2
  • 07/15/2020
  • Public Content
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