


SLARNV(3f)    LAPACK auxiliary routine (version 3.1)   SLARNV(3f)


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

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

           INTEGER        IDIST, N

           INTEGER        ISEED( 4 )

           REAL           X( * )

PURPOSE
       SLARNV returns a vector of n random real numbers from a uniform or nor-
       mal 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) REAL array, dimension (N)
               The generated random numbers.

FURTHER DETAILS
       This routine calls the auxiliary routine SLARUV 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.
















 LAPACK auxiliary routine November 2006                         1


