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author wolffd
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wolffd@0 1 <html>
wolffd@0 2 <head>
wolffd@0 3 <title>
wolffd@0 4 Netlab Reference Manual hesschek
wolffd@0 5 </title>
wolffd@0 6 </head>
wolffd@0 7 <body>
wolffd@0 8 <H1> hesschek
wolffd@0 9 </H1>
wolffd@0 10 <h2>
wolffd@0 11 Purpose
wolffd@0 12 </h2>
wolffd@0 13 Use central differences to confirm correct evaluation of Hessian matrix.
wolffd@0 14
wolffd@0 15 <p><h2>
wolffd@0 16 Synopsis
wolffd@0 17 </h2>
wolffd@0 18 <PRE>
wolffd@0 19 hesschek(net, x, t)
wolffd@0 20 h = hesschek(net, x, t)</PRE>
wolffd@0 21
wolffd@0 22
wolffd@0 23 <p><h2>
wolffd@0 24 Description
wolffd@0 25 </h2>
wolffd@0 26
wolffd@0 27 <p><CODE>hesschek(net, x, t)</CODE> takes a network data structure <CODE>net</CODE>, together
wolffd@0 28 with input and target data matrices <CODE>x</CODE> and <CODE>t</CODE>, and compares
wolffd@0 29 the evaluation of the Hessian matrix using the function <CODE>nethess</CODE>
wolffd@0 30 and using central differences with the function <CODE>neterr</CODE>.
wolffd@0 31
wolffd@0 32 <p>The optional return value <CODE>h</CODE> is the Hessian computed using
wolffd@0 33 <CODE>nethess</CODE>.
wolffd@0 34
wolffd@0 35 <p><h2>
wolffd@0 36 See Also
wolffd@0 37 </h2>
wolffd@0 38 <CODE><a href="nethess.htm">nethess</a></CODE>, <CODE><a href="neterr.htm">neterr</a></CODE><hr>
wolffd@0 39 <b>Pages:</b>
wolffd@0 40 <a href="index.htm">Index</a>
wolffd@0 41 <hr>
wolffd@0 42 <p>Copyright (c) Ian T Nabney (1996-9)
wolffd@0 43
wolffd@0 44
wolffd@0 45 </body>
wolffd@0 46 </html>