# laruv - Man Page

laruv: random uniform vector

## Synopsis

### Functions

subroutine **dlaruv** (iseed, n, x)**DLARUV** returns a vector of n random real numbers from a uniform distribution.

subroutine **slaruv** (iseed, n, x)**SLARUV** returns a vector of n random real numbers from a uniform distribution.

## Detailed Description

## Function Documentation

### subroutine dlaruv (integer, dimension( 4 ) iseed, integer n, double precision, dimension( n ) x)

**DLARUV** returns a vector of n random real numbers from a uniform distribution.

**Purpose:**

DLARUV returns a vector of n random real numbers from a uniform (0,1) distribution (n <= 128). This is an auxiliary routine called by DLARNV and ZLARNV.

**Parameters***ISEED*ISEED is INTEGER array, dimension (4) On entry, the seed of the random number generator; the array elements must be between 0 and 4095, and ISEED(4) must be odd. On exit, the seed is updated.

*N*N is INTEGER The number of random numbers to be generated. N <= 128.

*X*X is DOUBLE PRECISION array, dimension (N) The generated random numbers.

**Author**Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

**Further Details:**

This routine uses a multiplicative congruential method with modulus 2**48 and multiplier 33952834046453 (see G.S.Fishman, 'Multiplicative congruential random number generators with modulus 2**b: an exhaustive analysis for b = 32 and a partial analysis for b = 48', Math. Comp. 189, pp 331-344, 1990). 48-bit integers are stored in 4 integer array elements with 12 bits per element. Hence the routine is portable across machines with integers of 32 bits or more.

Definition at line **94** of file **dlaruv.f**.

### subroutine slaruv (integer, dimension( 4 ) iseed, integer n, real, dimension( n ) x)

**SLARUV** returns a vector of n random real numbers from a uniform distribution.

**Purpose:**

SLARUV returns a vector of n random real numbers from a uniform (0,1) distribution (n <= 128). This is an auxiliary routine called by SLARNV and CLARNV.

**Parameters***ISEED*ISEED is INTEGER array, dimension (4) On entry, the seed of the random number generator; the array elements must be between 0 and 4095, and ISEED(4) must be odd. On exit, the seed is updated.

*N*N is INTEGER The number of random numbers to be generated. N <= 128.

*X*X is REAL array, dimension (N) The generated random numbers.

**Author**Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

**Further Details:**

This routine uses a multiplicative congruential method with modulus 2**48 and multiplier 33952834046453 (see G.S.Fishman, 'Multiplicative congruential random number generators with modulus 2**b: an exhaustive analysis for b = 32 and a partial analysis for b = 48', Math. Comp. 189, pp 331-344, 1990). 48-bit integers are stored in 4 integer array elements with 12 bits per element. Hence the routine is portable across machines with integers of 32 bits or more.

Definition at line **94** of file **slaruv.f**.

## Author

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