How to extract data from multiple Matlab figures

Question

Safi ullah 2017-12-4

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https://ww2.mathworks.cn/matlabcentral/answers/371014-how-to-extract-data-from-multiple-matlab-figures

评论： Safi ullah 2017-12-5

Hello everyone, I have extracted data from Matlab figure saved in “.fig” format by using the following code

   open F1.fig   %%F1.fig is the first figure
   D = get(gca, 'children') 
   x=get(D, 'xdata');
   y=get(D,'ydata');
   z=get(D,'cdata');

x, y, and z are the extracted data of x,y and z components.For only one case I have total 90 figures so by using the above code for each figure take much time. Now I need to use the above code for all 90 figures and get the data at once. I tried by using for loop but it does not work. Thanks

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Answer 1

Walter Roberson 2017-12-4

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https://ww2.mathworks.cn/matlabcentral/answers/371014-how-to-extract-data-from-multiple-matlab-figures#answer_294623

编辑：Walter Roberson 2017-12-4

在 MATLAB Online 中打开

dinfo = dir('*.fig')
fignames = {dinfo.name};
numfig = length(fignames);
x = cell(numfig, 1);
y = cell(numfig, 1);
z = cell(numfig, 1);
for K = 1 : numfig
  figfile = fignames{K};
  try
    fig = openfig(figfile);
    ax = get(fig, 'CurrentAxes');
    if ~isempty(ax)
      D = get(ax, 'Children');
      x{K} = get(D, 'XData');
      y{K} = get(D, 'YData');
      z{K} = get(D, 'ZData');
    else
      fprintf('note: file "%s" has empty current axes\n', figfile);
    end
    close(fig);
  catch ME
     fprintf('note: file "%s" could not be opened as figure\n', figfile);
  end
end

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Walter Roberson 2017-12-5

That is what my code already does. It creates cell arrays, x, y, and z, each of which has one entry per figure. For figures in which there was only one axes child, the entry will be a numeric vector. For figures in which there was more than one axes child, the entry will be a cell array of numeric vectors, one entry per child.

You have a number of figures, and each figure has an unknown number of axes children, so you nested structures are to be expected.

Safi ullah 2017-12-5