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<HTML>
<HEAD>
<TITLE>TSP (libtsp/VR) - VRfCheckSym</TITLE>
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<BODY BGCOLOR="#FFFACD">
<H2>VRfCheckSym</H2>
<HR>
<H4>Routine</H4>
<DL>
<DT>
int VRfCheckSym (const float x[], int N)
</DL>
<H4>Purpose</H4>
<DL>
<DT>
Determine if an array of floats is symmetric or anti-symmetric
</DL>
<H4>Description</H4>
This procedure returns a value which indicates whether a given array of float
values is symmetric, anti-symmetric or neither. A symmetric array has values
which satisfy,
<PRE>
x[i] = x[N-i-1], for i = 0, 1, ..., N-1.
</PRE>
An anti-symmetric array has values which satisfy,
<PRE>
x[i] = -x[N-i-1], for i = 0, 1, ..., N-1.
</PRE>
An all-zero array will be declared to be symmetric.
<H4>Parameters</H4>
<DL>
<DT>
<- int VRfCheckSym
<DD>
integer value,
<PRE>
+1, if x[i] = x[N-i-1], for i = 0, 1, ..., N-1
-1, if x[i] = -x[N-i-1], for i = 0, 1, ..., N-1
0, otherwise
</PRE>
<DT>
-> const float x[]
<DD>
Array of floats (N elements)
<DT>
-> int N
<DD>
Number of elements in the input array
</DL>
<H4>Author / revision</H4>
P. Kabal Copyright (C) 1995
/ Revision 1.9 1995/02/09
<P>
<HR>
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</HTML>
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