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  gener­
       ate 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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