Developer Reference

Contents

v?LGamma

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

Syntax

vsLGamma
(
n
,
a
,
y
)
;
vsLGammaI(n, a, inca, y, incy);
vmsLGamma
(
n
,
a
,
y
,
mode
)
;
vmsLGammaI(n, a, inca, y, incy, mode);
vdLGamma
(
n
,
a
,
y
)
;
vdLGammaI(n, a, inca, y, incy);
vmdLGamma
(
n
,
a
,
y
,
mode
)
;
vmdLGammaI(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
vsLGamma
,
vmsLGamma
const double*
for
vdLGamma
,
vmdLGamma
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
vsLGamma
,
vmsLGamma
double*
for
vdLGamma
,
vmdLGamma
Pointer to an array that contains 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
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.