Extracting data from Matlab .fig with 2 different y-axes?
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Bakr Abdelgaliel
el 22 de Jun. de 2022
Comentada: Star Strider
el 23 de Jun. de 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 comentarios
Jan
el 22 de Jun. de 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.
Respuesta aceptada
Star Strider
el 22 de Jun. de 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 comentarios
Más respuestas (1)
dpb
el 22 de Jun. de 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 comentario
dpb
el 22 de Jun. de 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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