how to extract data from Matlab figure with stacked lines?

Please I have tried alot with this code

open('spectrum.fig');
a = get(gca,'Children');
xdata = get(a, 'XData');
ydata = get(a, 'YData');
xdata1 = get(a(2), 'XData');
ydata1 = get(a(2), 'YData');

but it doesnt work correctly I just get the last line data?!

Answer 1

[Voss]

f = openfig('intensity with lines.fig');

lines = findall(f,'Type','line')

lines = 
  10×1 Line array:

  Line
  Line
  Line
  Line
  Line
  Line
  Line
  Line
  Line
  Line

xdata = get(lines,'XData'); % xdata: 10x1 cell array, each cell contains 1 line's XData
ydata = get(lines,'YData'); % ydata: 10x1 cell array, each cell contains 1 line's YData

If you know that the lines XData/YData are all row vectors of the same size (which they are in this case), it may be convenienet to concatentate them into a single matrix:

xdata = vertcat(xdata{:})

xdata = 10×8192

1.0e-11 * -0.6250 -0.6248 -0.6247 -0.6245 -0.6244 -0.6242 -0.6241 -0.6239 -0.6238 -0.6236 -0.6235 -0.6233 -0.6232 -0.6230 -0.6229 -0.6227 -0.6226 -0.6224 -0.6223 -0.6221 -0.6219 -0.6218 -0.6216 -0.6215 -0.6213 -0.6212 -0.6210 -0.6209 -0.6207 -0.6206 -0.6250 -0.6248 -0.6247 -0.6245 -0.6244 -0.6242 -0.6241 -0.6239 -0.6238 -0.6236 -0.6235 -0.6233 -0.6232 -0.6230 -0.6229 -0.6227 -0.6226 -0.6224 -0.6223 -0.6221 -0.6219 -0.6218 -0.6216 -0.6215 -0.6213 -0.6212 -0.6210 -0.6209 -0.6207 -0.6206 -0.6250 -0.6248 -0.6247 -0.6245 -0.6244 -0.6242 -0.6241 -0.6239 -0.6238 -0.6236 -0.6235 -0.6233 -0.6232 -0.6230 -0.6229 -0.6227 -0.6226 -0.6224 -0.6223 -0.6221 -0.6219 -0.6218 -0.6216 -0.6215 -0.6213 -0.6212 -0.6210 -0.6209 -0.6207 -0.6206 -0.6250 -0.6248 -0.6247 -0.6245 -0.6244 -0.6242 -0.6241 -0.6239 -0.6238 -0.6236 -0.6235 -0.6233 -0.6232 -0.6230 -0.6229 -0.6227 -0.6226 -0.6224 -0.6223 -0.6221 -0.6219 -0.6218 -0.6216 -0.6215 -0.6213 -0.6212 -0.6210 -0.6209 -0.6207 -0.6206 -0.6250 -0.6248 -0.6247 -0.6245 -0.6244 -0.6242 -0.6241 -0.6239 -0.6238 -0.6236 -0.6235 -0.6233 -0.6232 -0.6230 -0.6229 -0.6227 -0.6226 -0.6224 -0.6223 -0.6221 -0.6219 -0.6218 -0.6216 -0.6215 -0.6213 -0.6212 -0.6210 -0.6209 -0.6207 -0.6206 -0.6250 -0.6248 -0.6247 -0.6245 -0.6244 -0.6242 -0.6241 -0.6239 -0.6238 -0.6236 -0.6235 -0.6233 -0.6232 -0.6230 -0.6229 -0.6227 -0.6226 -0.6224 -0.6223 -0.6221 -0.6219 -0.6218 -0.6216 -0.6215 -0.6213 -0.6212 -0.6210 -0.6209 -0.6207 -0.6206 -0.6250 -0.6248 -0.6247 -0.6245 -0.6244 -0.6242 -0.6241 -0.6239 -0.6238 -0.6236 -0.6235 -0.6233 -0.6232 -0.6230 -0.6229 -0.6227 -0.6226 -0.6224 -0.6223 -0.6221 -0.6219 -0.6218 -0.6216 -0.6215 -0.6213 -0.6212 -0.6210 -0.6209 -0.6207 -0.6206 -0.6250 -0.6248 -0.6247 -0.6245 -0.6244 -0.6242 -0.6241 -0.6239 -0.6238 -0.6236 -0.6235 -0.6233 -0.6232 -0.6230 -0.6229 -0.6227 -0.6226 -0.6224 -0.6223 -0.6221 -0.6219 -0.6218 -0.6216 -0.6215 -0.6213 -0.6212 -0.6210 -0.6209 -0.6207 -0.6206 -0.6250 -0.6248 -0.6247 -0.6245 -0.6244 -0.6242 -0.6241 -0.6239 -0.6238 -0.6236 -0.6235 -0.6233 -0.6232 -0.6230 -0.6229 -0.6227 -0.6226 -0.6224 -0.6223 -0.6221 -0.6219 -0.6218 -0.6216 -0.6215 -0.6213 -0.6212 -0.6210 -0.6209 -0.6207 -0.6206 -0.6250 -0.6248 -0.6247 -0.6245 -0.6244 -0.6242 -0.6241 -0.6239 -0.6238 -0.6236 -0.6235 -0.6233 -0.6232 -0.6230 -0.6229 -0.6227 -0.6226 -0.6224 -0.6223 -0.6221 -0.6219 -0.6218 -0.6216 -0.6215 -0.6213 -0.6212 -0.6210 -0.6209 -0.6207 -0.6206

ydata = vertcat(ydata{:})

ydata = 10×8192

1.0e+00 * 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000

so that xdata(1,:) is the first line's XData, xdata(2,:) is the second line's XData, etc., etc.