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<HTML>
<HEAD>
<TITLE>TSP (libtsp/VR) - VRfShift</TITLE>
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<BODY BGCOLOR="#FFFACD">
<H2>VRfShift</H2>
<HR>
<H4>Routine</H4>
<DL>
<DT>
void VRfShift (float x[], int Nkeep, int Nshift)
</DL>
<H4>Purpose</H4>
<DL>
<DT>
Shift the elements of an array of floats
</DL>
<H4>Description</H4>
This routine shifts elements of a float array. If the number of elements to
be retained is zero, no action is taken. For a shift down (Nshift positive),
the elements of the array are shifted down to the bottom of the array. The
input array must have at least Nkeep + Nshift elements.
<P>
<PRE>
x[i+Nshift] --> x[i], for i from 0 to Nkeep-1
</PRE>
<P>
For a shift up (Nshift negative), the elements of the array are shifted up to
the top of the array. The input array must have at least Nkeep - Nshift
elements (Nshift being negative).
<P>
<PRE>
x[i] --> x[i-Nshift], for i from Nkeep-1 to 0
</PRE>
<H4>Parameters</H4>
<DL>
<DT>
<-> float x[]
<DD>
Array of floats (Nkeep + |Nshift| elements)
<DT>
-> int Nkeep
<DD>
Number of elements to be retained
<DT>
-> int Nshift
<DD>
Number of positions to be shifted. Nshift is positive for a shift down
and negative for a shift up.
</DL>
<H4>Author / revision</H4>
P. Kabal Copyright (C) 1996
/ Revision 1.9 1996/06/26
<H4>See Also</H4>
<A HREF="VRfCopy.html">VRfCopy</A>
<P>
<HR>
Main Index <A HREF="../libtsp.html">libtsp</A>
</BODY>
</HTML>
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