Creating a gif from a matrix of double.

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andrea 2020-4-19

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编辑： Ameer Hamza 2020-4-20

Untitled.m

My problem is that I have a set of matrices , each matrix contain only 1 and -1.

What I'm trying to do is to make a gif of this matrices in succesion, so that the gif frames are the rapresenation of the the matrices with colors, black for -1 and white for 1 (somthing like imagesc) . But from my code somenthind do not work.

In my code x is a cell array which contains my matrices .

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Answer 1

Ameer Hamza 2020-4-20

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https://ww2.mathworks.cn/matlabcentral/answers/519071-creating-a-gif-from-a-matrix-of-double#answer_427070

编辑：Ameer Hamza 2020-4-20

在 MATLAB Online 中打开

See this example to create a gif using black and white imagesec() plots.

% 100 matrices of size 4x4 stored in cell array filled with random data
M = squeeze(mat2cell((rand(20,20,100) > 0.5)*2-1, 20, 20, ones(1,100)));
outFilename = 'myGifFile.gif';
fig = figure();
ax = axes();
colormap([0 0 0; 1 1 1]);
for i=1:100
    imagesc(ax, M{i});
    img = getframe(ax);
    img = rgb2gray(img.cdata);
    if i==1
        imwrite(img, outFilename, 'gif', 'LoopCount', inf, 'DelayTime', 0.05)
    else
        imwrite(img, outFilename, 'gif', 'WriteMode', 'append', 'DelayTime', 0.05);
    end
end

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Answer 2

Image Analyst 2020-4-19

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https://ww2.mathworks.cn/matlabcentral/answers/519071-creating-a-gif-from-a-matrix-of-double#answer_426934

See Steve's blog on how to make animated gifs: https://blogs.mathworks.com/steve/2019/02/07/animated-png-apng-files/?s_tid=srchtitle

If you want a non-animated one, just use imwrite().

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andrea 2020-4-19

Not really of any help. I just wanna an animated gif of a sequence matrices which entries are -1 and 1 , I don't know if helps but i'm trying to make an animated gif of an Ising Model simulation.

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