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<HTML>
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<TITLE>TSP (libtsp/SP) - SPautoc</TITLE>
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<BODY BGCOLOR="#FFFACD">
<H2>SPautoc</H2>
<HR>
<H4>Routine</H4>
<DL>
<DT>
void SPautoc (const float x[], int Nx, float cor[], int Nt)
</DL>
<H4>Purpose</H4>
<DL>
<DT>
Calculate the autocorrelation for a data sequence
</DL>
<H4>Description</H4>
This routine calculate the autocorrelation for a given data vector.
<PRE>
Nx-1-i
cor[i] = SUM x[k] * x[k+i] , for 0 <= i < Nt.
k=0
</PRE>
<P>
This routine requires
<PRE>
(Nt+1)*(Nx+Nt/2) multiplies and
(Nt+1)*(Nx+Nt/2) adds.
</PRE>
<H4>Parameters</H4>
<DL>
<DT>
-> const float x[]
<DD>
Input data vector with Nx elements
<DT>
-> int Nx
<DD>
Number of data points
<DT>
<- float cor[]
<DD>
Autocorrelation vector with Nt elements. The element cor[i] is the
autocorrelation with lag i.
<DT>
-> int Nt
<DD>
Number of autocorrelation terms
</DL>
<H4>Author / revision</H4>
P. Kabal Copyright (C) 1996
/ Revision 1.5 1996/05/06
<H4>See Also</H4>
<A HREF="SPcorXpc.html">SPcorXpc</A>,
<A HREF="SPcovar.html">SPcovar</A>
<P>
<HR>
Main Index <A HREF="../libtsp.html">libtsp</A>
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