📄 db_index.html

📁 Kohonen的SOM软件包

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<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN"><html><head><title>SOM Toolbox / db_index </title></head><body bgcolor=#f0f0f0><table border=0 width="100%" cellpadding=0 cellspacing=0><tr><td valign=baseline><font size=+2>SOM Toolbox</font></td><td valign=baseline align=center><a href="somtoolbox.html">Online documentation</td><td valign=baseline align=right><a href="http://www.cis.hut.fi/projects/somtoolbox/" target="_top">http://www.cis.hut.fi/projects/somtoolbox/</a></td></tr></table><hr><H1> db_index </H1><P><B> [t,r] = db_index(D, cl, C, p, q)</B></P><PRE> DB_INDEX Davies-Bouldin clustering evaluation index. [t,r] = db_index(D, cl, C, p, q)  Input and output arguments ([]'s are optional):      D     (matrix) data (n x dim)          (struct) map or data struct    cl    (vector) cluster numbers corresponding to data samples (n x 1)    [C]   (matrix) prototype vectors (c x dim) (default = cluster means)    [p]   (scalar) norm used in the computation (default == 2)    [q]   (scalar) moment used to calculate cluster dispersions (default = 2)     t     (scalar) Davies-Bouldin index for the clustering (=mean(r))    r     (vector) maximum DB index for each cluster (size c x 1)      See also  SOM_KMEANS, KMEANS_CLUSTERS, SOM_GAPINDEX.</PRE><p><hr><br><center>[ <a href="somtoolbox.html">SOM Toolbox online doc</a> ]</center><br><!-- Last updated: May 30 2002 --></body></html>

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