Extracting data from Matlab .fig with 2 different y-axes?
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Bakr Abdelgaliel
on 22 Jun 2022
Commented: Star Strider
on 23 Jun 2022
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');
3 Comments
Jan
on 22 Jun 2022
@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.
Accepted Answer
Star Strider
on 22 Jun 2022
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.
.
9 Comments
More Answers (1)
dpb
on 22 Jun 2022
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);
1 Comment
dpb
on 22 Jun 2022
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}
>>
gets you there more directly...
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