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<TITLE>TSP (libtsp/FN) - FNbessI0</TITLE>
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<H2>FNbessI0</H2>
<HR>
<H4>Routine</H4>
<DL>
<DT>
double FNbessI0 (double x)
</DL>
<H4>Purpose</H4>
<DL>
<DT>
Evaluate the zeroth-order modified Bessel function of first kind
</DL>
<H4>Description</H4>
This function returns the value of the zero'th order modified Bessel function
of the first kind. This function is defined as
<PRE>
1 2 pi
I0(z) = ---- Int exp (z cos(a)) da.
2 pi 0
</PRE>
This routine calculates an approximation using an infinite series. This
series is rapidly converging for moderate values of z.
<H4>Parameters</H4>
<DL>
<DT>
<- double FNbessI0
<DD>
Returned value
<DT>
-> double x
<DD>
Input value
</DL>
<H4>Author / revision</H4>
P. Kabal Copyright (C) 1996
/ Revision 1.1 1996/05/16
<P>
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