NAME

       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.

       Date:
           November 2011

       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.

Author

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