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<html><head><title>rand.c</title></head><body bgcolor=white><h1 align=center>Description of the routines contained in: <font color=Blue>rand.c</font></h1><hr>Sometimes it is useful to use sophisticated routines to produce randomnumbers. The file <a href="../../source_c/routines/rand.c">rand.c</a>contains a couple of quite good random number generators. If you want to use one of them, first callthe routine <font color=red>rnd_init(seed)</font> with some integernumber <font color=red>seed</font> to initialize the generators. Youhave the choice between the following generators:<ul><li><font color=red>rnd_long()</font>: It returns an unsigned longrandom number generated by the following rule:<br>x<font size =-1>n+1</font>=x<font size =-1>n-9689</font> XORx<font size =-1>n-157</font> XOR x<font size =-1>n-314</font> XORx<font size =-1>n-471</font><br>It has a period of 2^9689 and the numbers are uncorrelated up to 4point correlations.<li><font color=red>rnd_1279()</font>: It returns an unsigned longrandom number generated by the following rule:<br>x<font size =-1>n+1</font>=x<font size =-1>n-1279</font>+x<font size =-1>n-216</font>+x<font size =-1>n-299</font>+x<font size =-1>n-598</font><br>It has a period of 2^1279 and the numbers are uncorrelated up to 4point correlations.<li><font color=red>rnd69069()</font>: It returns an unsigned longrandom number generated by the following rule:<br>x<font size =-1>n+1</font>=x<font size =-1>n</font>*factor+1<br>where factor=69069 on 32 Bit machines and factor=13^13 on 64 Bitmachines. This one is fast and especially on 64 Bit machines good foralmost all purposes.<li><font color=red>gaussian()</font>: Returns random numbers whichare distributed gaussian with a variance of <font color=red>variance</font> centered around zero. Interally ituses the routine <font color=red>rnd_1279()</font>.</ul><hr>View the <a href="../../source_c/routines/rand.c"> C-sources</a>.<hr><a href=../contents.html>Table of Contents</a> * <a href="../../index.html" target="_top">TISEAN home</a></body></html>⌨️ 快捷键说明
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