CXML

LAPACK version 3.0

dlarnv(3)

PURPOSE

DLARNV - return a vector of n random real numbers from a uniform or normal distribution

SYNTAX

SUBROUTINE DLARNV( IDIST, ISEED, N, X ) INTEGER IDIST, N INTEGER ISEED( 4 ) DOUBLE PRECISION X( * )

DESCRIPTION

DLARNV returns a vector of n random real numbers from a uniform or normal distribution.

ARGUMENTS

IDIST (input) INTEGER Specifies the distribution of the random numbers: = 1: uniform (0,1) = 2: uniform (-1,1) = 3: normal (0,1) 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. X (output) DOUBLE PRECISION array, dimension (N) The generated random numbers.

FURTHER DETAILS

This routine calls the auxiliary routine DLARUV to generate random real numbers from a uniform (0,1) distribution, in batches of up to 128 using vectorisable code. The Box-Muller method is used to transform numbers from a uniform to a normal distribution.

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