# Uniform

Generates random numbers uniformly distributed over the interval `[a, b)`.

## Syntax

Fortran:

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

C:

status = viRngUniform( method, stream, n, r, a, b );

## Description

This 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∈Z; a < b`.

The probability distribution is given by:

The cumulative distribution function is as follows:

## Input Parameters

Name | Type | Description
--- | --- | ---
method | FORTRAN: INTEGER, INTENT(IN) C: int | Generation method; dummy and set to 0 in case of uniform distribution. The specific value is as follows: `VSL_METHOD_IUNIFORM_STD` Standard method. Currently there is only one method for this distribution generator.
stream | FORTRAN: TYPE (VSL_STREAM_STATE), INTENT(IN) C: VSLStreamStatePtr | FORTRAN: Descriptor of the stream state structure. C: Pointer to the stream state structure
n | FORTRAN: INTEGER, INTENT(IN) C: int | Number of random values to be generated
a | FORTRAN: INTEGER, INTENT(IN) C: int | Left interval bound a
b | FORTRAN: INTEGER, INTENT(IN) C: int | Right interval bound b

## Output Parameters

Name | Type | Description
--- | --- | ---
r | FORTRAN: INTEGER, INTENT(OUT) C: int* | 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_ERROR_BAD_STREAM

  stream is not a valid random stream.

VSL_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_ERROR_NO_NUMBERS

  Callback function for an abstract BRNG returns 0 as the number of updated entries in a buffer.

Parent topic: Discrete Distributions