laruv(3) LAPACK laruv(3)
NAME
laruv - laruv: random uniform vector
SYNOPSIS
Functions
subroutine dlaruv (iseed, n, x)
DLARUV returns a vector of n random real numbers from a uniform
distribution.
subroutine slaruv (iseed, n, x)
SLARUV returns a vector of n random real numbers from a uniform
distribution.
Detailed Description
Function Documentation
subroutine dlaruv (integer, dimension( 4 ) iseed, integer n, double
precision, dimension( n ) x)
DLARUV returns a vector of n random real numbers from a uniform
distribution.
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.
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.
N
N is INTEGER
The number of random numbers to be generated. N <= 128.
X
X is DOUBLE PRECISION array, dimension (N)
The generated random numbers.
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.
subroutine slaruv (integer, dimension( 4 ) iseed, integer n, real,
dimension( n ) x)
SLARUV returns a vector of n random real numbers from a uniform
distribution.
Purpose:
SLARUV returns a vector of n random real numbers from a uniform (0,1)
distribution (n <= 128).
This is an auxiliary routine called by SLARNV and CLARNV.
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.
N
N is INTEGER
The number of random numbers to be generated. N <= 128.
X
X is REAL array, dimension (N)
The generated random numbers.
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.
Author
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