LAPACK  3.4.2
LAPACK: Linear Algebra PACKage
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dlaran.f File Reference

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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:
[in,out]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.

Definition at line 68 of file dlaran.f.

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