TESTING/MATGEN/dlaran.f(3)

NAME
TESTING/MATGEN/dlaran.f

SYNOPSIS

  Functions/Subroutines
double precision function dlaran (iseed)
DLARAN

Function/Subroutine Documentation

  double precision function dlaran (integer, dimension( 4 ) iseed)

DLARAN

Purpose:

     DLARAN returns a random real number from a uniform (0,1)
     distribution.

Parameters
    ISEED

              ISEED is 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.

Author
    Univ. of Tennessee

    Univ. of California Berkeley

    Univ. of Colorado Denver

    NAG Ltd.

Further Details:

      This routine uses a multiplicative congruential method with modulus
      2**48 and multiplier 33952834046453 (see G.S.Fishman,
      'Multiplicative congruential random number generators with modulus
      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.

Definition at line 66 of file dlaran.f.

Author

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