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<HTML>
<HEAD>
<TITLE>TSP (libtsp/MS) - MSfUnifRand</TITLE>
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<BODY BGCOLOR="#FFFACD">
<H2>MSfUnifRand</H2>
<HR>
<H4>Routine</H4>
<DL>
<DT>
double MSfUnifRand (void)
<DT>
void MSrandSeed (int seed)
</DL>
<H4>Purpose</H4>
<DL>
<DT>
Generate a uniformly distributed pseudo-random value
<DT>
Reseed the uniform pseudo-random value
</DL>
<H4>Description</H4>
This routine generates uniformly distributed pseudo-random numbers. The
multiplicative congruential method is used to generate integer pseudo-random
numbers, is = (a*is) % m. The values a=16807 and m=2147483647 are used.
These values have been shown to give good results. Further, the values
generated are shuffled to give better serial correlation properties. The
pseudo-random number generation routine is self initializing, but if a
different sequence of pseudo-random values is desired, the routine MSrandSeed
can be used to supply a starting (seed) value.
<P>
<DL>
<DT>
Reference:
<DD>
W. H. Press, S. A. Teukolsky, W. T. Vetterling, B. P. Flannery,
"Numerical Recipes in C" (2nd ed.) (p. 280), Cambridge University Press,
1992.
</DL>
<H4>Parameters</H4>
<DL>
<DT>
MSfUnifRand:
<DT>
<- double MSfUnifRand
<DD>
Uniform deviate with values between 0 and 1, exclusive of the end points.
<DT>
MSrandSeed:
<DT>
-> int seed
<DD>
Seed value. A positive seed value sets the pseudo-random generation to a
new sequence. A zero value sets the actual seed to a value based on the
current time. The default sequence can be restarted by setting the seed
value to 12345.
</DL>
<H4>Author / revision</H4>
P. Kabal Copyright (C) 1997
/ Revision 1.14 1997/10/14
<H4>See Also</H4>
<A HREF="MSfGaussRand.html">MSfGaussRand</A>
<P>
<HR>
Main Index <A HREF="../libtsp.html">libtsp</A>
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