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annotate toolboxes/FullBNT-1.0.7/netlab3.3/hintmat.m @ 0:e9a9cd732c1e tip

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first hg version after svn
author wolffd
date Tue, 10 Feb 2015 15:05:51 +0000
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wolffd@0 1 function [xvals, yvals, color] = hintmat(w);
wolffd@0 2 %HINTMAT Evaluates the coordinates of the patches for a Hinton diagram.
wolffd@0 3 %
wolffd@0 4 % Description
wolffd@0 5 % [xvals, yvals, color] = hintmat(w)
wolffd@0 6 % takes a matrix W and returns coordinates XVALS, YVALS for the
wolffd@0 7 % patches comrising the Hinton diagram, together with a vector COLOR
wolffd@0 8 % labelling the color (black or white) of the corresponding elements
wolffd@0 9 % according to their sign.
wolffd@0 10 %
wolffd@0 11 % See also
wolffd@0 12 % HINTON
wolffd@0 13 %
wolffd@0 14
wolffd@0 15 % Copyright (c) Ian T Nabney (1996-2001)
wolffd@0 16
wolffd@0 17 % Set scale to be up to 0.9 of maximum absolute weight value, where scale
wolffd@0 18 % defined so that area of box proportional to weight value.
wolffd@0 19
wolffd@0 20 w = flipud(w);
wolffd@0 21 [nrows, ncols] = size(w);
wolffd@0 22
wolffd@0 23 scale = 0.45*sqrt(abs(w)/max(max(abs(w))));
wolffd@0 24 scale = scale(:);
wolffd@0 25 color = 0.5*(sign(w(:)) + 3);
wolffd@0 26
wolffd@0 27 delx = 1;
wolffd@0 28 dely = 1;
wolffd@0 29 [X, Y] = meshgrid(0.5*delx:delx:(ncols-0.5*delx), 0.5*dely:dely:(nrows-0.5*dely));
wolffd@0 30
wolffd@0 31 % Now convert from matrix format to column vector format, and then duplicate
wolffd@0 32 % columns with appropriate offsets determined by normalized weight magnitudes.
wolffd@0 33
wolffd@0 34 xtemp = X(:);
wolffd@0 35 ytemp = Y(:);
wolffd@0 36
wolffd@0 37 xvals = [xtemp-delx*scale, xtemp+delx*scale, ...
wolffd@0 38 xtemp+delx*scale, xtemp-delx*scale];
wolffd@0 39 yvals = [ytemp-dely*scale, ytemp-dely*scale, ...
wolffd@0 40 ytemp+dely*scale, ytemp+dely*scale];
wolffd@0 41