Abdelrahman Said
194 lines
5.2 KiB
C
194 lines
5.2 KiB
C
/* -- translated by f2c (version 20240504).
|
|
You must link the resulting object file with libf2c:
|
|
on Microsoft Windows system, link with libf2c.lib;
|
|
on Linux or Unix systems, link with .../path/to/libf2c.a -lm
|
|
or, if you install libf2c.a in a standard place, with -lf2c -lm
|
|
-- in that order, at the end of the command line, as in
|
|
cc *.o -lf2c -lm
|
|
Source for libf2c is in /netlib/f2c/libf2c.zip, e.g.,
|
|
|
|
http://www.netlib.org/f2c/libf2c.zip
|
|
*/
|
|
|
|
#include "f2c.h"
|
|
|
|
/* > \brief \b DLARNV returns a vector of random numbers from a uniform or normal distribution.
|
|
|
|
=========== DOCUMENTATION ===========
|
|
|
|
Online html documentation available at
|
|
http://www.netlib.org/lapack/explore-html/
|
|
|
|
> \htmlonly
|
|
> Download DLARNV + dependencies
|
|
> <a href="http://www.netlib.org/cgi-bin/netlibfiles.tgz?format=tgz&filename=/lapack/lapack_routine/dlarnv.
|
|
f">
|
|
> [TGZ]</a>
|
|
> <a href="http://www.netlib.org/cgi-bin/netlibfiles.zip?format=zip&filename=/lapack/lapack_routine/dlarnv.
|
|
f">
|
|
> [ZIP]</a>
|
|
> <a href="http://www.netlib.org/cgi-bin/netlibfiles.txt?format=txt&filename=/lapack/lapack_routine/dlarnv.
|
|
f">
|
|
> [TXT]</a>
|
|
> \endhtmlonly
|
|
|
|
Definition:
|
|
===========
|
|
|
|
SUBROUTINE DLARNV( IDIST, ISEED, N, X )
|
|
|
|
INTEGER IDIST, N
|
|
INTEGER ISEED( 4 )
|
|
DOUBLE PRECISION X( * )
|
|
|
|
|
|
> \par Purpose:
|
|
=============
|
|
>
|
|
> \verbatim
|
|
>
|
|
> DLARNV returns a vector of n random real numbers from a uniform or
|
|
> normal distribution.
|
|
> \endverbatim
|
|
|
|
Arguments:
|
|
==========
|
|
|
|
> \param[in] IDIST
|
|
> \verbatim
|
|
> IDIST is INTEGER
|
|
> Specifies the distribution of the random numbers:
|
|
> = 1: uniform (0,1)
|
|
> = 2: uniform (-1,1)
|
|
> = 3: normal (0,1)
|
|
> \endverbatim
|
|
>
|
|
> \param[in,out] ISEED
|
|
> \verbatim
|
|
> 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.
|
|
> \endverbatim
|
|
>
|
|
> \param[in] N
|
|
> \verbatim
|
|
> N is INTEGER
|
|
> The number of random numbers to be generated.
|
|
> \endverbatim
|
|
>
|
|
> \param[out] X
|
|
> \verbatim
|
|
> X is DOUBLE PRECISION array, dimension (N)
|
|
> The generated random numbers.
|
|
> \endverbatim
|
|
|
|
Authors:
|
|
========
|
|
|
|
> \author Univ. of Tennessee
|
|
> \author Univ. of California Berkeley
|
|
> \author Univ. of Colorado Denver
|
|
> \author NAG Ltd.
|
|
|
|
> \date September 2012
|
|
|
|
> \ingroup auxOTHERauxiliary
|
|
|
|
> \par Further Details:
|
|
=====================
|
|
>
|
|
> \verbatim
|
|
>
|
|
> 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.
|
|
> \endverbatim
|
|
>
|
|
=====================================================================
|
|
Subroutine */ int igraphdlarnv_(integer *idist, integer *iseed, integer *n,
|
|
doublereal *x)
|
|
{
|
|
/* System generated locals */
|
|
integer i__1, i__2, i__3;
|
|
|
|
/* Builtin functions */
|
|
double log(doublereal), sqrt(doublereal), cos(doublereal);
|
|
|
|
/* Local variables */
|
|
integer i__;
|
|
doublereal u[128];
|
|
integer il, iv, il2;
|
|
extern /* Subroutine */ int igraphdlaruv_(integer *, integer *, doublereal *);
|
|
|
|
|
|
/* -- LAPACK auxiliary routine (version 3.4.2) --
|
|
-- LAPACK is a software package provided by Univ. of Tennessee, --
|
|
-- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
|
|
September 2012
|
|
|
|
|
|
=====================================================================
|
|
|
|
|
|
Parameter adjustments */
|
|
--x;
|
|
--iseed;
|
|
|
|
/* Function Body */
|
|
i__1 = *n;
|
|
for (iv = 1; iv <= i__1; iv += 64) {
|
|
/* Computing MIN */
|
|
i__2 = 64, i__3 = *n - iv + 1;
|
|
il = min(i__2,i__3);
|
|
if (*idist == 3) {
|
|
il2 = il << 1;
|
|
} else {
|
|
il2 = il;
|
|
}
|
|
|
|
/* Call DLARUV to generate IL2 numbers from a uniform (0,1)
|
|
distribution (IL2 <= LV) */
|
|
|
|
igraphdlaruv_(&iseed[1], &il2, u);
|
|
|
|
if (*idist == 1) {
|
|
|
|
/* Copy generated numbers */
|
|
|
|
i__2 = il;
|
|
for (i__ = 1; i__ <= i__2; ++i__) {
|
|
x[iv + i__ - 1] = u[i__ - 1];
|
|
/* L10: */
|
|
}
|
|
} else if (*idist == 2) {
|
|
|
|
/* Convert generated numbers to uniform (-1,1) distribution */
|
|
|
|
i__2 = il;
|
|
for (i__ = 1; i__ <= i__2; ++i__) {
|
|
x[iv + i__ - 1] = u[i__ - 1] * 2. - 1.;
|
|
/* L20: */
|
|
}
|
|
} else if (*idist == 3) {
|
|
|
|
/* Convert generated numbers to normal (0,1) distribution */
|
|
|
|
i__2 = il;
|
|
for (i__ = 1; i__ <= i__2; ++i__) {
|
|
x[iv + i__ - 1] = sqrt(log(u[(i__ << 1) - 2]) * -2.) * cos(u[(
|
|
i__ << 1) - 1] * 6.2831853071795864769252867663);
|
|
/* L30: */
|
|
}
|
|
}
|
|
/* L40: */
|
|
}
|
|
return 0;
|
|
|
|
/* End of DLARNV */
|
|
|
|
} /* igraphdlarnv_ */
|
|
|