Developer Reference

Contents

vRngGamma

Generates gamma distributed random values.

Syntax

status
=
vsRngGamma
(
method
,
stream
,
n
,
r
,
alpha
,
a
,
beta
);
status
=
vdRngGamma
(
method
,
stream
,
n
,
r
,
alpha
,
a
,
beta
);
Include Files
  • mkl.h
Input Parameters
Name
Type
Description
method
const MKL_INT
Generation method. The specific values are as follows:
VSL_RNG_METHOD_GAMMA_GNORM
VSL_RNG_METHOD_GAMMA_GNORM_ACCURATE
Acceptance/rejection method using random numbers with Gaussian distribution.
See brief description of the method
GNORM
in Table
"Values of
<
method
>
in
method
parameter"
stream
VSLStreamStatePtr
Pointer to the stream state structure
n
const MKL_INT
Number of random values to be generated
alpha
const float
for
vsRngGamma
const double
for
vdRngGamma
Shape
α
.
a
const float
for
vsRngGamma
const double
for
vdRngGamma
Displacement
a
.
beta
const float
for
vsRngGamma
const double
for
vdRngGamma
Scalefactor
β
.
Output Parameters
Name
Type
Description
r
float*
for
vsRngGamma
double*
for
vdRngGamma
Vector of
n
random numbers with gamma distribution
Description
The
vRngGamma
function generates random numbers with gamma distribution that has shape parameter
α
, displacement
a
, and scale parameter
β
, where
α
,
β
, and
a
R
;
α
> 0,
β
> 0
.
The probability density function is given by:
Equation
where
Γ
(
α
) is the complete gamma function.
The cumulative distribution function is as follows:
Equation
Product and Performance Information
Performance varies by use, configuration and other factors. Learn more at www.Intel.com/PerformanceIndex.
Notice revision #20201201
Return Values
VSL_ERROR_OK, VSL_STATUS_OK
Indicates no error, execution is successful.
VSL_ERROR_NULL_PTR
stream
is a
NULL
pointer.
VSL_RNG_ERROR_BAD_STREAM
stream
is not a valid random stream.
VSL_RNG_ERROR_BAD_UPDATE
Callback function for an abstract BRNG returns an invalid number of updated entries in a buffer, that is,
< 0
or
>
nmax
.
VSL_RNG_ERROR_NO_NUMBERS
Callback function for an abstract BRNG returns 0 as the number of updated entries in a buffer.
VSL_RNG_ERROR_QRNG_PERIOD_ELAPSED
Period of the generator has been exceeded.
VSL_RNG_ERROR_NONDETERM_NRETRIES_EXCEEDED
Number of retries to generate a random number by using non-deterministic random number generator exceeds threshold.
VSL_RNG_ERROR_ARS5_NOT_SUPPORTED
ARS-5 random number generator is not supported on the CPU running the application.

Product and Performance Information

1

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