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Netlab Reference Manual hesschek
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<H1> hesschek
</H1>
<h2>
Purpose
</h2>
Use central differences to confirm correct evaluation of Hessian matrix.
<p><h2>
Synopsis
</h2>
<PRE>
hesschek(net, x, t)
h = hesschek(net, x, t)</PRE>
<p><h2>
Description
</h2>
<p><CODE>hesschek(net, x, t)</CODE> takes a network data structure <CODE>net</CODE>, together
with input and target data matrices <CODE>x</CODE> and <CODE>t</CODE>, and compares
the evaluation of the Hessian matrix using the function <CODE>nethess</CODE>
and using central differences with the function <CODE>neterr</CODE>.
<p>The optional return value <CODE>h</CODE> is the Hessian computed using
<CODE>nethess</CODE>.
<p><h2>
See Also
</h2>
<CODE><a href="nethess.htm">nethess</a></CODE>, <CODE><a href="neterr.htm">neterr</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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