Extracting data from Matlab .fig with 2 different y-axes?

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Bakr Abdelgaliel 2022-6-22

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https://ww2.mathworks.cn/matlabcentral/answers/1745940-extracting-data-from-matlab-fig-with-2-different-y-axes

评论： Star Strider 2022-6-23

采纳的回答： Star Strider

MyFig.fig

在 MATLAB Online 中打开

I have a figuer with two different y-axes, and i would like to extract both of the data with its relevant x-axis data. I have used the following script, but their is an error when writing axesObj(2)!

fig=openfig('MyFig.fig');
axesObj = get(gcf, 'Children');
datObj1 = get(axesObj(1), 'Children');
datObj2 = get(axesObj(2), 'Children');
xdat1 = get(datObj1, 'XData');
ydat1 = get(datObj1, 'YData');
xdat2 = get(datObj2, 'XData');
ydat2 = get(datObj2, 'YData');

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Jan 2022-6-22

@Bakr Abdelgaliel: Whenever you mention an error in the forum, attach a copy of the complete meesage. It is easier to fix an error than to guess, what the error is.

Bakr Abdelgaliel 2022-6-22

@Image Analyst thanks for your reply.

I have attached the file now. unfortunatly, I dont have the original data.

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Star Strider 2022-6-22

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https://ww2.mathworks.cn/matlabcentral/answers/1745940-extracting-data-from-matlab-fig-with-2-different-y-axes#answer_991210

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Try something like this —

x = linspace(0, 10);

y1 = sin(2*pi*x/max(x));

y2 = exp(-0.2*x) .* cos(3*pi*x/max(x));

figure

yyaxis left

plot(x, y1)

yyaxis right

plot(x, y2)

Lines = findobj(gca, 'Type','line'); % 'Right' Line Is 'Line(1)', 'Left' Line is 'Line(1)'

RightX = Lines(1).XData;

RightY = Lines(1).YData;

LeftX = Lines(2).XData;

LeftY = Lines(2).YData;

This could be version-dependent. However this should work with recent MATLAB versions.

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Bakr Abdelgaliel 2022-6-23

@Star Strider Deep thanks for you

Star Strider 2022-6-23

As always, my pleasure!

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dpb 2022-6-22

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The two y-axes could have been drawn w/ the yyaxis function in which case there aren't actually two separate axes -- and it's not the axes you're tying to get, anyways, but the line handles...

While strongly agree w/ @Image Analyst that the way/time to do/have done this was when the figure was created and had the data to create it with instead -- but, there are occasional reasons such as the figure came from elsewhere that it's necessary to scrape the figure file --

hL=findobj(gcf,'type','line');      % return the line handle(s) of the figure
xData=arrayfun(@(hL)hL.XData.',hL,'UniformOutput',1);   % return cell array of size number lines found
yData=arrayfun(@(hL)hL.YData.',hL,'UniformOutput',1);

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dpb 2022-6-22

在 MATLAB Online 中打开

hF=openfig('MyFig.fig');
hL=findobj(gcf,'type','line');
x=arrayfun(@(hL)hL.XData.',hL,'UniformOutput',0);
y=arrayfun(@(hL)hL.YData.',hL,'UniformOutput',0)
y =
  2×1 cell array
    {18×1 double}
    {18×1 double}
>>