Plot binary matrix as dot

Question

maoster 2015-6-25

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评论： the cyclist 2022-7-21

Hi,

I have this matrix that indicates a location [0 0 0 0 1 0 1 1 0 0 1 0 0 0]. I want to plot the value of 1 from this matrix using dot as the marker. How can I do it?

Thanks.

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maxanto 2021-6-18

spy([1 1 0; 0 0 0; 1 0 1])

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Answer 1

James Tursa 2015-6-25

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Another way:

spy(sparse(x));

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Leyla Elyasizad 2022-7-18

Does it work for big matrix?

I used it for a big matrix it seems that it is squeezing the figure

the cyclist 2022-7-21

When you say "squeezing", what do you mean?

My best guess is that perhaps the aspect ratio of the figure is not what you expect? You could do commands like axis square or axis equal, and see if that gives more like what you expect. (There are other options, as well.)

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Answer 2

maxanto 2021-6-18

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https://ww2.mathworks.cn/matlabcentral/answers/225311-plot-binary-matrix-as-dot#answer_727325

spy([1 1 0; 0 0 0; 1 0 1])

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Answer 3

the cyclist 2015-6-25

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编辑：the cyclist 2015-6-25

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One guess at what you want. If this is not what you want, I suggest you add detailed explanation.

figure
x = [0 0 0 0 1 0 1 1 0 0 1 0 0 0];
x(x==0) = NaN; % Changing the value of x. If you need it preserved, save to a new variable.
h = plot(1:numel(x),x,'k.');
set(h,'MarkerSize',24)
xlim([0.5 numel(x)+0.5])