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<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN"><html><head><title>SOM Toolbox / som_map_struct </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_map_struct </H1><H3> Purpose </H3><PRE> Creates a self-organizing map structure. </PRE><H3> Syntax </H3><UL><PRE> sM = som_map_struct(dim) sM = som_map_struct(...,'argID',value,...); sM = som_map_struct(...,value,...);</PRE></UL><H3> Description </H3><PRE> Creates a self-organizing map struct. The struct contains the map codebook, labels, topology, information on normalization and training, as well as component names and a name for the map. The obligatory parameter is the map dimension. Most of the other fields can be given values using optional arguments. If they are left unspecified, default values are used. Field Type Size / default value (munits = prod(msize)) ------------------------------------------------------------------------ .type (string) 'som_map' .name (string) 'SOM date' .codebook (matrix) rand(munits, dim) .topol (struct) topology struct, with the following fields .type (string) 'som_topol' .msize (vector) size k x 1, [0] .lattice (string) 'hexa' .shape (string) 'sheet' .labels (cellstr) size munits x m, {''; ''; ... ''} .neigh (string) 'gaussian' .mask (vector) size dim x 1, [1; 1; ...; 1] .trainhist (cell array) size tl x 1, [] .comp_names (cellstr) size dim x 1, {'Variable1', 'Variable2', ...} .comp_norm (cell array) size dim x 1, {[], [], ... []} '.type' field is the struct identifier. Do not change it. '.name' field is the identifier for the whole map struct '.codebook' field is the codebook matrix, each row corresponds to one unit '.topol' field is the topology of the map. This struct has three fields: '.msize' field is the dimensions of the map grid. Note that the matrix notation of indeces is used. '.lattice' field is the map grid lattice '.shape' field is the map grid shape '.labels' field contains the labels for each of the vectors. The ith row of '.labels' contains the labels for ith map unit. Note that if some vectors have more labels than others, the others are are given empty labels ('') to pad the '.labels' array up. '.neigh' field is the neighborhood function. '.mask' field is the BMU search mask. '.trainhist' field contains information on the training. It is a cell array of training structs. The first training struct contains information on initialization, the others on actual trainings. If the map has not been initialized, '.trainhist' is empty ([]). '.comp_names' field contains the names of the vector components '.comp_norm' field contains normalization information for each component. Each cell of '.comp_norm' is itself a cell array of normalization structs. If no normalizations are performed for the particular component, the cell is empty ([]).</PRE><H3> Required input arguments </H3><PRE> dim (scalar) Input space dimension. </PRE><H3> Optional input arguments </H3><PRE> argID (string) Argument identifier string (see below). value (varies) Value for the argument (see below). The optional arguments are given as 'argID',value -pairs. If the value is unambiguous (marked below with '*'), it can be given without the preceeding argID. If an argument is given value multiple times, the last one is used. 'mask' (vector) BMU search mask, size dim x 1 'msize' (vector) map grid size, default is [0] 'labels' (string array / cellstr) labels for each map unit, length=prod(msize) 'name' (string) map name 'comp_names' (string array / cellstr) component names, size dim x 1 'comp_norm' (cell array) normalization operations for each component, size dim x 1. Each cell is either empty, or a cell array of normalization structs. 'lattice' *(string) map lattice, 'hexa' or 'rect' 'shape' *(string) map shape, 'sheet', 'cyl' or 'toroid' 'topol' *(struct) topology struct, sets msize, lattice and shape 'som_topol','sTopol' = 'topol' 'neigh' *(string) neighborhood function, 'gaussian', 'cutgauss', 'ep' or 'bubble'</PRE><H3> Output arguments </H3><PRE> sMap (struct) the map struct</PRE><H3> Examples </H3><PRE> Simplest case: sMap = som_map_struct(3); With optional arguments, the other fields can be given values: sTo = som_set('som_topol','msize',[10 5]); labs = cell(50, 1); labs{1, 1} = 'first_unit'; cnames = {'first'; 'second'; 'third'}; sN = som_set('som_norm'); csN = {sN; sN; sN}; sMap = som_map_struct(3,'msize',[10 5],'rect'); sMap = som_map_struct(3,'msize',[10 5],'lattice','rect'); sMap = som_map_struct(3,sTo,'bubble','labels',labs); sMap = som_map_struct(3,sTo,'comp_names',cnames); sMap = som_map_struct(3,sTo,'name','a data struct'); sMap = som_map_struct(3,sTo,'comp_norm',csN,'mask',[1 0 0.5]);</PRE><H3> See also </H3><TABLE NOBORDER WIDTH=80%><TR><TD><a href="som_set.html"><B>som_set</B></a><TD> Set values and create SOM Toolbox structs.<TR><TD><a href="som_data_struct.html"><B>som_data_struct</B></a><TD> Create a data struct.<TR><TD><a href="som_make.html"><B>som_make</B></a><TD> Initialize and train self-organizing map.<TR><TD><a href="som_topol_struct.html"><B>som_topol_struct</B></a><TD> Default values for map topology.</TABLE><p><hr><br><br><!-- Last updated: May 30 2002 --></body></html>⌨️ 快捷键说明
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