Display values of each element in imagesc

Question

Peter Fraser 2021-10-10

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1560896-display-values-of-each-element-in-imagesc

评论： Peter Fraser 2021-10-11

I have a 16 x 16 array of values between 0 and 40. I would like to display this using imagesc, but I would also like to superimpose the decimal value of each element in its corresponding square. I would end up with a 16 x 16 array of colored (per mapping) squares, each with the square's value in decimal text. Is there an easy / convenient way to do this?

If there was a version of "disp" that I could apply to a figure after imagesc that might work, but I can't find one.

Thanks

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Answer 1

Chunru 2021-10-11

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https://ww2.mathworks.cn/matlabcentral/answers/1560896-display-values-of-each-element-in-imagesc#answer_805716

在 MATLAB Online 中打开

c = randi([0 40], [16 16]);

heatmap(c);

colormap(jet(512))

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Peter Fraser 2021-10-11

Perfect, thanks

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Answer 2

Walter Roberson 2021-10-11

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https://ww2.mathworks.cn/matlabcentral/answers/1560896-display-values-of-each-element-in-imagesc#answer_805721

在 MATLAB Online 中打开

Is there an easy / convenient way to do this?

No. But it can be done.

Note: there is no one text font color that will contrast nicely with all of the underlaying colors -- not unless you colormap() in a different colormap such as copper() that you can find a simple text color for.

A = randi([0 40], 16, 16); %sample data

[R, C] = ndgrid(1:size(A,1), 1:size(A,2));

R = R(:); C = C(:) - 1/4;

%rows are Y values, columns are X values !

imagesc(A)

vals = A(:);

mask = vals <= 20;

text(C(mask), R(mask), string(vals(mask)), 'color', 'w')

text(C(~mask), R(~mask), string(vals(~mask)), 'color', 'k')

A

A = 16×16

28 33 29 4 1 22 13 4 7 6 16 27 34 39 7 11 40 14 37 8 14 25 10 12 6 40 0 40 27 28 29 21 6 3 16 31 35 3 31 23 7 18 40 19 39 2 7 6 15 36 7 6 1 5 18 33 27 25 22 14 14 8 16 38 27 7 39 37 11 15 28 1 4 32 8 37 7 38 29 32 0 3 32 34 10 9 1 26 17 17 19 5 15 16 6 9 37 4 13 10 34 23 29 37 36 16 19 26 4 5 19 37 14 23 32 15 5 11 26 37 4 3 14 22 22 27 5 21 6 33 16 13 31 23 25 37 33 1 14 5 0 21 6 18 22 2 21 15 11 25 1 18 14 23 9 19 8 19 17 6