dlaruv(3)

NAME

DLARUV - return a vector of n random real numbers from a

uniform (0,1)

SYNOPSIS

SUBROUTINE DLARUV( ISEED, N, X )
    INTEGER        N
    INTEGER        ISEED( 4 )
    DOUBLE         PRECISION X( N )

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.

ARGUMENTS

ISEED (input/output) 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 (input) INTEGER

The number of random numbers to be generated. N <=

128.

X (output) DOUBLE PRECISION array, dimension (N)

The generated random numbers.

FURTHER DETAILS

This routine uses a multiplicative congruential method

with modulus 2**48 and multiplier 33952834046453 (see G.S.Fish

man,
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.

LAPACK version 3.0 15 June 2000

DLARUV(3)