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