Plotting a grid of filled squares from true/false values in MATLAB

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P 2013-11-27

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https://ww2.mathworks.cn/matlabcentral/answers/107846-plotting-a-grid-of-filled-squares-from-true-false-values-in-matlab

评论： Walter Roberson 2013-11-28

I want to create a grid of equal squares in MATLAB. I have a matrix which stores mixed values of 1 or a 0. I want the 1's to represent black squares and the 0's to be white with a white outline encapsulating the black squares for clearness/black grid lines for white boxes.

There is no need for units or values on either axis (i'm representing some shaded/unshaded PV panels).

The pseudocode is something like:

   For(x row of variable, y column of variable)
     If (variablename(x,y)) value = 1
       draw a black square with white outline
    elseif (variablename(x,y)) value = 0
       draw a white square with black outline
       end
    end

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Answer 1

Walter Roberson 2013-11-28

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Something like this (untested)

[sx, sy] = size(YourLogicalMatrix);
rectangle([sx/2 sy/2 1/2 1/2], 'facecolor', 'b');
[x, y] = find(YourLogicalMatrix);
for K = 1 : length(x)
  rectangle([x(K)-1/2, Y(K)-1/2, 1, 1], 'Linewidth', 2, 'EdgeColor', 'w');
end

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P 2013-11-28

编辑：P 2013-11-28

在 MATLAB Online 中打开

Am I correcting or adding those lines? I tried both. Adding them after the end of the loop yields:

??? Undefined function or method 'Y' for input arguments of type 'double'.

And a blue coloured rectangle appears with no grid lines.

Correcting lines 2 and 5 with the new code yields the same blue box and the same error message.

To test it I did

wallshading = ones(11,6)
wallshading(1:8) = 0

And then ran the script with wallshading as the variable. Thanks.

Walter Roberson 2013-11-28

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[sx, sy] = size(YourLogicalMatrix);
rectangle('Position', [sx/2 sy/2 1/2 1/2], 'facecolor', 'b');
[x, y] = find(YourLogicalMatrix);
for K = 1 : length(x)
  rectangle('Position', [x(K)-1/2, y(K)-1/2, 1, 1], 'Linewidth', 2, 'EdgeColor', 'w');
end

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Answer 2

P 2013-11-28

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/107846-plotting-a-grid-of-filled-squares-from-true-false-values-in-matlab#answer_116577

在 MATLAB Online 中打开

tried

imagesc(wallshading);
colormap(gray);
grid on;

how can resize the squares to fit the dimensions and get the grid lines to be black for the white squares and vice versa? (it will look a little bit like a checkerboard)