DLARUV (3lapack)

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 )

PURPOSE

  DLARUV returns a vector of n random real numbers from a uniform (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-, 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.