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

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

Answer 1

[Walter Roberson]

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

[P]

I tried inputting my logical matrix which is a variable called 'WallShading'

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

returns

?? Error using ==> rectangle
Too many input arguments.
Error in ==> SunPathScriptRoof at 280
rectangle([sx/2 sy/2 1/2 1/2], 'facecolor', 'b');

WallShading is an 11x6 matrix of type double consisting of either 0's or 1's

[Walter Roberson]

rectangle('Position', [sx/2 sy/2 1/2 1/2], 'facecolor', 'b');

rectangle('Position', [x(K)-1/2, Y(K)-1/2, 1, 1], 'Linewidth', 2, 'EdgeColor', 'w');

[P]

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]

[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

Answer 2

[P]

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)