sammon.html

来自「Kohonen的SOM软件包」· HTML 代码 · 共 69 行

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<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN"><html><head><title>SOM Toolbox / sammon </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> sammon </H1><P><B> P = sammon(D, P, varargin)</B></P><PRE>SAMMON Computes Sammon's mapping of a data set. P = sammon(D, P, [value], [mode], [alpha], [Mdist])  P = sammon(D,2);            % projection to 2-dim space  P = sammon(sMap,3);         % projects the codebook vectors  P = sammon(sMap,3,[],[],[],Md) % uses distance matrix Md  som_grid(sMap,'Coord',P)    % visualization of map projection  Input and output arguments ([]'s are optional):   D        (matrix) size dlen x dim, data to be projected            (struct) data or map struct               P        (scalar) output dimension            (matrix) size dlen x odim, initial projection matrix   [value]  (scalar) all different modes (the next argument) require                      a value, default = 100   [mode]   (string) 'steps' or 'errlimit' or 'errchange' or 'seconds',                     see below, default is 'steps'   [alpha]  (scalar) iteration step size, default = 0.2   [Dist]   (matrix) pairwise distance matrix, size dlen x dlen.                     If the distances in the input space should                     be calculated otherwise than as euclidian                     distances, the distance from each vector                     to each other vector can be given here,                     size dlen x dlen. For example PDIST                     function can be used to calculate the                     distances: Dist = squareform(pdist(D,'mahal'));   P        (matrix) size dlen x odim, the projections The output dimension must be 2 or higher but (naturally) lower  than data set dimension. The mode argument determines the end condition for iteration. If  the mode argument is used, also the value argument has to be  specified. Different mode possibilities are: 'steps'      the iteration is terminated when it is run <value>  'errlimit'   steps, the iteration is terminated when projection error               is lower than <value>, 'errchange'  the iteration is terminated when change between               projection error on two successive iteration rounds	       is less than <value> percent of total error, and 'seconds'    the iteration is terminated after <value> seconds               of iteration. See also CCA, PCAPROJ, SOM_GRID.</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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