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IRIX 6.2 Development Libraries
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SGI IRIX 6.2 Development Libraries.iso
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dlarnv.z
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dlarnv
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1996-03-14
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67 lines
DDDDLLLLAAAARRRRNNNNVVVV((((3333FFFF)))) DDDDLLLLAAAARRRRNNNNVVVV((((3333FFFF))))
NNNNAAAAMMMMEEEE
DLARNV - return a vector of n random real numbers from a uniform or
normal distribution
SSSSYYYYNNNNOOOOPPPPSSSSIIIISSSS
SUBROUTINE DLARNV( IDIST, ISEED, N, X )
INTEGER IDIST, N
INTEGER ISEED( 4 )
DOUBLE PRECISION X( * )
PPPPUUUURRRRPPPPOOOOSSSSEEEE
DLARNV returns a vector of n random real numbers from a uniform or normal
distribution.
AAAARRRRGGGGUUUUMMMMEEEENNNNTTTTSSSS
IDIST (input) INTEGER
Specifies the distribution of the random numbers:
= 1: uniform (0,1)
= 2: uniform (-1,1)
= 3: normal (0,1)
ISEED (input/output) 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 (input) INTEGER
The number of random numbers to be generated.
X (output) DOUBLE PRECISION array, dimension (N)
The generated random numbers.
FFFFUUUURRRRTTTTHHHHEEEERRRR DDDDEEEETTTTAAAAIIIILLLLSSSS
This routine calls the auxiliary routine DLARUV to generate random real
numbers from a uniform (0,1) distribution, in batches of up to 128 using
vectorisable code. The Box-Muller method is used to transform numbers
from a uniform to a normal distribution.
PPPPaaaaggggeeee 1111