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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 )



     #include <sunperf.h>

     void dlaruv(int *iseed, int n, double *x) ;

PURPOSE
     DLARUV returns a vector of n random real numbers from a uni-
     form (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.Fishman,
     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.

Партнёры:

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