how do i combine figures' y - values

Hi, I have 57 graphs saved as figures. I want to combine all 57 graphs to make just one curve overall. I've tried copy and pasting the plots onto another graph but this just puts two functions on one graph. I've attached 3 of the graphs if someone would like to demonstrate how to do so.

Answer 1

[Image Analyst]

Save the data - the numbers - not the figures themselves. Then just have a program that read in all the data, say 57 .mat files or whatever, and plot them in one axes.

[Ellis]

Thanks Image Analysis, I'm struggling to do this, as I'm quite new to Matlab. Do you mind explaining in a bit more depth how to do this?

[Image Analyst]

Well you plotted something didn't you? Let's say you plotted y

plot(y, 'b-');

Now, instead of saving the whole figure with export_fig(gcf), just save the y values:

save('file 1', 'y');

Now just do that for all 57 different things you plot. Save to 57 different files, then recall them later with load().

[Ellis]

Hi Image Analysis I've tried done this but what next? I've saved them as such then loaded but I don't know what to do next.

Answer 2

[Thorsten]

How to extract data from a fig is described in http://www.mathworks.com/matlabcentral/answers/100687-how-do-i-extract-data-from-matlab-figures

You just put it in a loop

 ydata = zeros(1, 59991);
 for i=1:57
   open(sprintf('../../Downloads/figurefile%d.fig', i))
   dataObjs = get(get(gcf, 'Children'), 'Children')
   if i == 1, xdata = get(dataObjs(1), 'Xdata'); end
   ydata = ydata + get(dataObjs(1), 'Ydata');
 end

You see, fig files are not a good idea for data exchange. Use mat files instead. Ideally, store each ydata in a separate row of a single matrix 57x 59991 matrix P. Then just load P and use plot(sum, P).

[Star Strider]

That code works for R2014a and previous releases, but not for R2014b and later releases.