root / www / HPL_rand.html
Historique | Voir | Annoter | Télécharger (1,32 ko)
| 1 |
<HTML>
|
|---|---|
| 2 |
<HEAD>
|
| 3 |
<TITLE>HPL_rand HPL 2.0 Library Functions September 10, 2008</TITLE> |
| 4 |
</HEAD>
|
| 5 |
|
| 6 |
<BODY BGCOLOR="WHITE" TEXT = "#000000" LINK = "#0000ff" VLINK = "#000099" |
| 7 |
ALINK = "#ffff00"> |
| 8 |
|
| 9 |
<H1>Name</H1> |
| 10 |
<B>HPL_rand</B> random number generator. |
| 11 |
|
| 12 |
<H1>Synopsis</H1> |
| 13 |
<CODE>#include "hpl.h"</CODE><BR><BR> |
| 14 |
<CODE>double</CODE> |
| 15 |
<CODE>HPL_rand();</CODE> |
| 16 |
|
| 17 |
<H1>Description</H1> |
| 18 |
<B>HPL_rand</B> |
| 19 |
generates the next number in the random sequence. This |
| 20 |
function ensures that this number lies in the interval (-0.5, 0.5]. |
| 21 |
|
| 22 |
The static array irand contains the information (2 integers) required |
| 23 |
to generate the next number in the sequence X(n). This number is |
| 24 |
computed as X(n) = (2^16 * irand[1] + irand[0]) / d - 0.5, where the |
| 25 |
constant d is the largest 32 bit positive integer. The array irand is |
| 26 |
then updated for the generation of the next number X(n+1) in the |
| 27 |
random sequence as follows X(n+1) = a * X(n) + c. The constants a and |
| 28 |
c should have been preliminarily stored in the arrays ias and ics as |
| 29 |
2 pairs of integers. The initialization of ias, ics and irand is |
| 30 |
performed by the function HPL_setran. |
| 31 |
|
| 32 |
<H1>See Also</H1> |
| 33 |
<A HREF="HPL_ladd.html">HPL_ladd</A>, |
| 34 |
<A HREF="HPL_lmul.html">HPL_lmul</A>, |
| 35 |
<A HREF="HPL_setran.html">HPL_setran</A>, |
| 36 |
<A HREF="HPL_xjumpm.html">HPL_xjumpm</A>, |
| 37 |
<A HREF="HPL_jumpit.html">HPL_jumpit</A>. |
| 38 |
|
| 39 |
</BODY>
|
| 40 |
</HTML>
|