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Netlab Reference Manual dist2
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<H1> dist2
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<h2>
Purpose
</h2>
Calculates squared distance between two sets of points.

<p><h2>
Synopsis
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<PRE>
d = dist2(x, c)
</PRE>


<p><h2>
Description
</h2>
<CODE>d = dist2(x, c)</CODE> takes two matrices of vectors and calculates the
squared Euclidean distance between them.  Both matrices must be of the
same column dimension.  If <CODE>x</CODE> has <CODE>m</CODE> rows and <CODE>n</CODE> columns, and
<CODE>c</CODE> has <CODE>l</CODE> rows and <CODE>n</CODE> columns, then the result has
<CODE>m</CODE> rows and <CODE>l</CODE> columns.  The <CODE>i, j</CODE>th entry is the
squared distance from the <CODE>i</CODE>th row of <CODE>x</CODE> to the <CODE>j</CODE>th
row of <CODE>c</CODE>.

<p><h2>
Example
</h2>
The following code is used in <CODE>rbffwd</CODE> to calculate the activation of
a thin plate spline function.
<PRE>

n2 = dist2(x, c);
z = log(n2.^(n2.^2));
</PRE>


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See Also
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<CODE><a href="gmmactiv.htm">gmmactiv</a></CODE>, <CODE><a href="kmeans.htm">kmeans</a></CODE>, <CODE><a href="rbffwd.htm">rbffwd</a></CODE><hr>
<b>Pages:</b>
<a href="index.htm">Index</a>
<hr>
<p>Copyright (c) Ian T Nabney (1996-9)


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author	wolffd
date	Tue, 10 Feb 2015 15:05:51 +0000
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