MATLAB: Imagesc – insert grid lines

imagesc plot line

Hello,

m = 21 x 21 matrix

I want to draw grid lines onto the imagesc figure to signify certain groupings. And I don't want to do this manually since I have ~20 of these.

eg. black box around [1:3,1:3] to indicate that 1:3 is one group. red box around [5:10,5:10]

Best Answer

imagesc(randn(21,21));
hold on;
h1 = rectangle('position',[1 1 3 3]);
set(h1,'EdgeColor',[0 0 0],'linewidth',3);
h2 = rectangle('position',[5 5 10 10]);
set(h2,'EdgeColor',[1 0 0],'linewidth',3);

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h1 = plot([], 'DisplayName','want to withdraw this if line unexist');      % Blue line
hold on;
h2 = plot(rand(1,10),'r', 'DisplayName','hello');  % Red line
h3 = plot(rand(1,10),'g', 'DisplayName','world');  % Green line
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MATLAB: How to add a background rectangle to figure using figure toolbar

You cannot place a rectangle in the background using 'insert' -> 'rectangle'.

Instead, create the rectangle in the command window / script and just add shapes/lines as desired, adding the object you want on top last. For example:

>> figure1 = figure;
>> axes1 = axes('Parent', figure1);
>> hold(axes1,'on');
>> rectangle('Parent',axes1,'Position',[3 3 3 3],'FaceColor',[1 0 0]); % Plots the rectangle
>> plot(1:10); % Plots the line

'Insert' -> 'rectangle' actually creates an annotation in the shape of a rectangle, rather than just a rectangle.

Best Answer

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