Generates random numbers with uniform distribution.
Syntax
Fortran:
status = vsrnguniform( method, stream, n, r, a, b )
status = vdrnguniform( method, stream, n, r, a, b )
C:
status = vsRngUniform( method, stream, n, r, a, b );
status = vdRngUniform( method, stream, n, r, a, b );
Include Files
The FORTRAN 77 interfaces are specified in the mkl_vsl.f77 include file, the Fortran 90 interfaces are specified in the mkl_vsl.f90 include file, and the C interfaces are specified in the mkl_vsl_functions.h include file.
Input Parameters
Name |
Type |
Description |
|---|---|---|
method |
FORTRAN 77: INTEGER Fortran 90: INTEGER, INTENT(IN) C: const int |
Generation method; the specific values are as follows: VSL_RNG_METHOD_UNIFORM_STDVSL_RNG_METHOD_UNIFORM_STD_ACCURATEStandard method. |
stream |
FORTRAN 77: INTEGER*4 stream(2) Fortran 90: TYPE (VSL_STREAM_STATE), INTENT(IN) C: VSLStreamStatePtr |
Fortran: Descriptor of the stream state structure. C: Pointer to the stream state structure |
n |
FORTRAN 77: INTEGER Fortran 90: INTEGER, INTENT(IN) C: const int |
Number of random values to be generated |
a |
FORTRAN 77: REAL for vsrnguniform DOUBLE PRECISION for vdrnguniform Fortran 90: REAL, INTENT(IN) for vsrnguniform DOUBLE PRECISION, INTENT(IN) for vdrnguniform C: const float for vsRngUniform const double for vdRngUniform |
Left bound a |
b |
FORTRAN 77: REAL for vsrnguniform DOUBLE PRECISION for vdrnguniform Fortran 90: REAL, INTENT(IN) for vsrnguniform DOUBLE PRECISION, INTENT(IN) for vdrnguniform C: const float for vsRngUniform const double for vdRngUniform |
Right bound b |
Output Parameters
Name |
Type |
Description |
|---|---|---|
r |
FORTRAN 77: REAL for vsrnguniform DOUBLE PRECISION for vdrnguniform Fortran 90: REAL, INTENT(OUT) for vsrnguniform DOUBLE PRECISION, INTENT(OUT) for vdrnguniform C: float* for vsRngUniform double* for vdRngUniform |
Vector of n random numbers uniformly distributed over the interval [a,b] |
Description
The Uniform 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, b ∈ R ; a < b.
The probability density function is given by:
The cumulative distribution function is as follows:
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.