How to insert a saved .png figure into a subplot which is being created in a for loop?

Question

hello_world 2016-8-28

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/301129-how-to-insert-a-saved-png-figure-into-a-subplot-which-is-being-created-in-a-for-loop

编辑： hello_world 2016-8-28

采纳的回答： Walter Roberson

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Hello Friends,

I have the following code

for k = 1:2
subplot(1,3,k)
plot(randi(10,k));
end

I want to insert a saved .png (I prefer .png, but if it is easier for .fig, it is also ok) into this subplot which is being created in for loop at position subplot(1,3,1). This way, the inserted figure will come at the first position moving other two subfigures to the next available positions.

I will appreciate any advise!

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Answer 1

Walter Roberson 2016-8-28

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https://ww2.mathworks.cn/matlabcentral/answers/301129-how-to-insert-a-saved-png-figure-into-a-subplot-which-is-being-created-in-a-for-loop#answer_232950

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subplot(1,3,1)
image( imread('ThePNGFile.png') );
for k = 1:2
  subplot(1,3,k+1)
  plot(randi(10,k));
end

See also the XData and YData properties of image() and imshow() if you want to draw an image at a particular location in an axes that has other graphics.

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hello_world 2016-8-28

编辑：hello_world 2016-8-28

Thanks. Could you please show an example of extracting something from the .fig and put it into an axes?

Adding axis image shrinks the .png image to it's normal size while other two images are quite big in height which makes it look odd.

Walter Roberson 2016-8-28

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ax = subplot(1, 3, 1);
fig = openfig('MyFile.fig', 'visible', 'off');
imh = findobj(fig, 'type', 'image');
copyobj(imh, ax);
delete(fig);

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Answer 2

Image Analyst 2016-8-28

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https://ww2.mathworks.cn/matlabcentral/answers/301129-how-to-insert-a-saved-png-figure-into-a-subplot-which-is-being-created-in-a-for-loop#answer_232983

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Try this:

for k = 1:3
    subplot(1,3,k)
    % Insert image into subplot.
    filename = whatever......
    thisImage = imread(filename);
    imshow(thisImage);
    hold on;
    % Now draw the plot over it.
    plot(x, y);
    drawnow;
end

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hello_world 2016-8-28

编辑：hello_world 2016-8-28

在 MATLAB Online 中打开

Thanks! What are x and y please?

Using your code as follows gives the same .png subfigure in all subplots:

for k = 1:3
    subplot(1,3,k)
    % Insert image into subplot.
    filename = 'myFig.png';
    thisImage = imread(filename);
    imshow(thisImage);
    hold on;
    % Now draw the plot over it.
    plot(randi(10,k));
    %plot(x, y);
    drawnow;
end