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1 function color = som_normcolor(data, clrmap)
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2
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3 %SOM_NORMCOLOR RGB values of indexed colors for a given dataset and colormap
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4 %
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5 % color = som_normcolor(data, [clrmap])
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6 %
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7 % color = som_normcolor(data);
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8 % color = som_normcolor(data,jet(64));
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9 %
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10 % Input and output arguments ([]'s are optional):
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11 % data (struct) map or data struct
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12 % (matrix) size N x dim
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13 % [clrmap] (matrix) size N x 3, a valid colormap (an RGB value matrix)
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14 % Default is current colormap. See COLORMAP.
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15 %
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16 % color (matrix) size N x 3 x dim, RGB matrix
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17 %
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18 % Purpose of this function is to calculate fixed RGB colors that are similar
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19 % to indexed colors with the specified colormap. This is because some
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20 % SOM Toolbox visualization functions (as SOM_GRID) do not use indexed colors
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21 % if the underlying Matlab function (e.g. PLOT) do not use indexed colors
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22 %
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23 % EXAMPLE
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24 %
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25 % %%% Visualize three variables in a map using som_grid:
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26 % %%% Give coordinates for the markers according to variables 1 and 2, and
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27 % %%% 'indexed colors' according to variable 3.
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28 %
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29 % som_grid(map.topol.lattice,map.topol.msize,'Coord',map.codebook(:,1:2), ...
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30 % 'markercolor', som_normcolor(map.codebook(:,3)));
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31
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32 % Contributed to SOM Toolbox 2.0, February 11th, 2000 by Johan Himberg
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33 % Copyright (c) by Johan Himberg
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34 % http://www.cis.hut.fi/projects/somtoolbox/
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35
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36 % juha 150799 johan 010999
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37
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38 %%%% check possible errors %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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39
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40 error(nargchk(1,2,nargin));
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41
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42 if nargin < 2| isempty(clrmap),
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43 clrmap=colormap;
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44 elseif ~vis_valuetype(clrmap,{'nx3rgb'}),
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45 error('The specified colormap is invalid!');
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46 end
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47
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48 d=size(clrmap,1);
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49
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50 if isstruct(data),
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51 m_names={'type';'codebook';'topol';'labels';'neigh';'mask';'trainhist';...
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52 'name';'comp_names';'comp_norm'};
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53 d_names=fieldnames(vis_struct);
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54 if length(fieldnames(data)) ~= length(d_names) % data is not som_data_struct
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55 if length(fieldnames(data)) ~= length(m_names) % and not som_map_struct
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56 error('Input argument is not a ''som_vis'' or ''som_map'' struct.')
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57 elseif ~all(strcmp(fieldnames(data),m_names))
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58 error('Input argument is not a ''som_vis'' or ''som_map'' struct.')
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59 else
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60 data=data.codebook;
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61 end
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62 elseif ~all(strcmp(fieldnames(data),dnames))
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63 error('Input argument is not a ''som_vis'' or ''som_map'' struct.')
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64 else
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65 data=data.data;
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66 end
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67 end
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68
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69 if ~isnumeric(data) | ndims(data) ~= 2
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70 error('Data is not 2 dimensional numeric matrix.');
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71 end
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72
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73 %%% action %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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74
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75 data=som_normalize(data,'range');
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76
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77 for i=1:size(data,2),
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78 inds=~isnan(data(:,i));
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79 color(inds,:,i)=clrmap(round(data(inds,i)*(d-1))+1,:);
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80 color(~inds,:,i)=NaN;
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81 end
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83
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