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60 lines
1.5 KiB
Matlab
60 lines
1.5 KiB
Matlab
function [h, display_array] = displayData(X, example_width)
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%DISPLAYDATA Display 2D data in a nice grid
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% [h, display_array] = DISPLAYDATA(X, example_width) displays 2D data
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% stored in X in a nice grid. It returns the figure handle h and the
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% displayed array if requested.
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% Set example_width automatically if not passed in
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if ~exist('example_width', 'var') || isempty(example_width)
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example_width = round(sqrt(size(X, 2)));
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end
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% Gray Image
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colormap(gray);
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% Compute rows, cols
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[m n] = size(X);
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example_height = (n / example_width);
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% Compute number of items to display
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display_rows = floor(sqrt(m));
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display_cols = ceil(m / display_rows);
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% Between images padding
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pad = 1;
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% Setup blank display
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display_array = - ones(pad + display_rows * (example_height + pad), ...
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pad + display_cols * (example_width + pad));
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% Copy each example into a patch on the display array
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curr_ex = 1;
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for j = 1:display_rows
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for i = 1:display_cols
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if curr_ex > m,
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break;
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end
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% Copy the patch
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% Get the max value of the patch
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max_val = max(abs(X(curr_ex, :)));
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display_array(pad + (j - 1) * (example_height + pad) + (1:example_height), ...
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pad + (i - 1) * (example_width + pad) + (1:example_width)) = ...
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reshape(X(curr_ex, :), example_height, example_width) / max_val;
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curr_ex = curr_ex + 1;
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end
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if curr_ex > m,
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break;
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end
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end
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% Display Image
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h = imagesc(display_array, [-1 1]);
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% Do not show axis
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axis image off
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drawnow;
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end
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