Extract data from figure with multiple axes

Hi,

I want to extract data from a figure which I have created using "tightplot" ( https://uk.mathworks.com/matlabcentral/fileexchange/45380-tightplots ). The function generates different cooradinate systems using axes.

I now want to extract the data from the figures. I tried this ( https://uk.mathworks.com/matlabcentral/answers/177990-how-do-i-pull-data-from-a-figure-with-multiple-plots ) but it does not work.

Here is an example of the figure:

figure;
ha=tight_subplot(2,2,0.08,[0.1000,0.0250],[0.08,0.025]);
%plot1
axes(ha(1)); 
plot(1:10);
%plot2
axes(ha(2)); 
plot(-1:-1:-10);
%plot3
axes(ha(3)); 
plot(1:10);
%plot4
axes(ha(4)); 
plot(-1:-1:-10);

[Adam]

Do you not have the original data any more? It's a lot easier to keep the actual data than to start extracting it from plots. I haven't used tightplots, but its outputs appear to be all the axes handles so surely it is just a case of getting XData, YData, CData or whatever you want from each of these axes handles?

[dpb]

Agree w/ Adam; just iterate through the hA array, retrieving the .Children handle(s) for each and then the subsequent .X|YData thereof.

Or, you could use findobj to get the 'Line' objects for the axes; eeny-meeny which way to go...

Answer 1

[Chris]

I am not quite sure what you mean. Can you give an example?

[Adam]

It really depends what is on the axes and whether you knnow in advance what is on each given axes.

But

ch = get( ha(1), 'Children' )

will give you a list of the graphics objects on the first axes.

ch(1).XData
ch(1).YData

would give you the XData and YData from the first child, assuming it is something like and image or line plot which has these properties.

[Chris]

Thanks! Got it. And how can I get the ha, if I only have the figuere?

[dpb]

Not very adventurous, are you??? :)

hF=gcf;
hAx=hF.Children;  % presuming there are axes extant, of course

or,

hAx=findobj(hF,'Type','axes');