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TESTING/MATGEN/tmglib_64_obj/dlaran.f(3) Library Functions Manual TESTING/MATGEN/tmglib_64_obj/dlaran.f(3)

NAME

TESTING/MATGEN/tmglib_64_obj/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 67 of file dlaran.f.

Author

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