Developer Reference for Intel® oneAPI Math Kernel Library for Fortran

ID 766686
Date 3/31/2023
Public

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vRngUniform Continuous Distribution Generators

Generates random numbers with uniform distribution.

Syntax

status = vsrnguniform( method, stream, n, r, a, b )

status = vdrnguniform( method, stream, n, r, a, b )

Include Files
  • mkl.fi, mkl_vsl.f90
Description

The vRngUniform function generates random numbers uniformly distributed over the interval [a, b), where a, b are the left and right bounds of the interval, respectively, and a, bR ; a < b.

The probability density function is given by:


Equation

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

Input Parameters

Name

Type

Description

method

INTEGER, INTENT(IN)

Generation method; the specific values are as follows:

VSL_RNG_METHOD_UNIFORM_STD
VSL_RNG_METHOD_UNIFORM_STD_ACCURATE

Standard method.

stream

TYPE (VSL_STREAM_STATE), INTENT(IN)

Descriptor of the stream state structure.

n

INTEGER, INTENT(IN)

Number of random values to be generated.

a

DOUBLE PRECISION for vdrnguniform

REAL (KIND=4), INTENT(IN) for vsrnguniform

REAL (KIND=8), INTENT(IN) for vdrnguniform

Left bound a.

b

DOUBLE PRECISION for vdrnguniform

REAL (KIND=4), INTENT(IN) for vsrnguniform

REAL (KIND=8), INTENT(IN) for vdrnguniform

Right bound b.

Output Parameters

Name

Type

Description

r

DOUBLE PRECISION for vdrnguniform

REAL (KIND=4), INTENT(OUT) for vsrnguniform

REAL (KIND=8), INTENT(OUT) for vdrnguniform

Vector of n random numbers uniformly distributed over the interval [a,b)

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.