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<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN"><html><head><title>SOM Toolbox / som_hits </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> som_hits </H1><H3> Purpose </H3><PRE> Calculate the response of the given data on the map.</PRE><H3> Syntax </H3><UL><PRE> hits = som_hits(sMap, sData) hits = som_hits(M, D) hits = som_hits(..., mode)</PRE></UL><H3> Description </H3><PRE> Returns a vector indicating the response of the map to the data. The response of the data on the map can be calculated e.g. in three ways, selected with the mode argument: 'crisp' traditional hit histogram: how many times each map unit was the BMU for the data set 'kernel' a sum of neighborhood kernels, where a kernel is positioned on the BMU of each data sample. The neighborhood function is sMap.neigh and the neighborhood width is sMap.trainhist(end).radius_fin or 1 if this is not available 'fuzzy' fuzzy response calculated by summing 1 ------------ 1 + (q/a)^2 for each data sample, where q is a vector containing distance from the data sample to each map unit and a is average quantization error</PRE><H3> Required input arguments </H3><PRE> sMap The vectors from among which the BMUs are searched for. These must not have any unknown components (NaNs). (struct) map struct (matrix) codebook matrix, size munits x dim sData The data vector(s) for which the BMUs are searched. (struct) data struct (matrix) data matrix, size dlen x dim</PRE><H3> Optional input arguments </H3><PRE> mode (string) The respond mode: 'crisp' (default), 'kernel' or 'fuzzy'. 'kernel' can only be used if the first argument (sMap) is a map struct. </PRE><H3> Output arguments </H3><PRE> hits (vector) The number of hits in each map unit.</PRE><H3> Examples </H3><PRE> hits = som_hits(sM,D); hits = som_hits(sM,D,'kernel'); hits = som_hits(sM,D,'fuzzy');</PRE><H3> See also </H3><TABLE NOBORDER WIDTH=80%><TR><TD><a href="som_bmus.html"><B>som_bmus</B></a><TD> Find BMUs and quantization errors for a given data set.</TABLE><p><hr><br><br><!-- Last updated: May 30 2002 --></body></html>⌨️ 快捷键说明
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