dlarnv(3F)

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

SYNOPSIS
     SUBROUTINE DLARNV( IDIST, ISEED, N, X )

         INTEGER        IDIST, N

         INTEGER        ISEED( 4 )

         DOUBLE         PRECISION X( * )

PURPOSE
     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.