Imagesc - insert grid lines

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susan
susan on 26 Oct 2011
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]

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Accepted Answer

Wayne King
Wayne King on 26 Oct 2011
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);
  1 Comment
Image Analyst
Image Analyst on 27 Oct 2011
Oh, is that what she wanted? Just simply displaying lines going from pixel center to pixel center? That's easy. I thought she wanted to go *around* the pixels, like right along the edges of the pixels, not through the centers, like Steve Eddins did on his recent blog entry.

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