📄 demopt1.htm
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<html><head><title>Netlab Reference Manual demopt1</title></head><body><H1> demopt1</H1><h2>Purpose</h2>Demonstrate different optimisers on Rosenbrock's function.<p><h2>Synopsis</h2><PRE>demopt1demopt1(xinit)</PRE><p><h2>Description</h2>The four general optimisers (quasi-Newton, conjugate gradients, scaled conjugate gradients, and gradient descent) are applied tothe minimisation of Rosenbrock's well known `banana' function.Each optimiser is run for at most 100 cycles, and a stoppingcriterion of 1.0e-4 is used for both position and function value.At the end, the trajectory of each algorithm is shown on a contourplot of the function.<p><CODE>demopt1(xinit)</CODE> allows the user to specify a row vector withtwo columns as the starting point. The default is the point [-1 1].Note that the contour plot has an x range of [-1.5, 1.5] and a yrange of [-0.5, 2.1], so it is best to choose a starting point in thesame region.<p><h2>See Also</h2><CODE><a href="conjgrad.htm">conjgrad</a></CODE>, <CODE><a href="graddesc.htm">graddesc</a></CODE>, <CODE><a href="quasinew.htm">quasinew</a></CODE>, <CODE><a href="scg.htm">scg</a></CODE>, <CODE><a href="rosen.htm">rosen</a></CODE>, <CODE><a href="rosegrad.htm">rosegrad</a></CODE><hr><b>Pages:</b><a href="index.htm">Index</a><hr><p>Copyright (c) Ian T Nabney (1996-9)</body></html>⌨️ 快捷键说明
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