Developer Reference

  • 2020.2
  • 07/15/2020
  • Public Content
Contents

v?LGamma

Computes the natural logarithm of the absolute value of gamma function for vector elements.

Syntax

call vslgamma
(
n
,
a
,
y
)
call vslgammai(n, a, inca, y, incy)
call vmslgamma
(
n
,
a
,
y
,
mode
)
call vmslgammai(n, a, inca, y, incy, mode)
call vdlgamma
(
n
,
a
,
y
)
call vdlgammai(n, a, inca, y, incy)
call vmdlgamma
(
n
,
a
,
y
,
mode
)
call vmdlgammai(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
vdlgamma
,
vmdlgamma
REAL
,
INTENT(IN)
for
vslgamma
,
vmslgamma
DOUBLE PRECISION
,
INTENT(IN)
for
vdlgamma
,
vmdlgamma
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
vdlgamma
,
vmdlgamma
REAL
,
INTENT(OUT)
for
vslgamma
,
vmslgamma
DOUBLE PRECISION
,
INTENT(OUT)
for
vdlgamma
,
vmdlgamma
Array that specifies the output vector
y
.
Description
The
v?LGamma
function computes the natural logarithm of the absolute value of gamma function for elements of the input vector
a
and writes them to the output vector
y
. Precision overflow thresholds for the
v?LGamma
function are beyond the scope of this document. If the result does not meet the target precision, the function raises the
OVERFLOW
exception and sets the VM Error Status to
VML_STATUS_OVERFLOW
.
Special Values for Real Function
v?LGamma(x)
Argument
Result
VM Error Status
Exception
+1
+0
 
 
+2
+0
 
 
+0
+
VML_STATUS_SING
ZERODIVIDE
-0
+
VML_STATUS_SING
ZERODIVIDE
negative integer
+
VML_STATUS_SING
ZERODIVIDE
-
+
 
 
+
+
 
 
X > overflow
+
VML_STATUS_OVERFLOW
OVERFLOW
<