MATLAB: How I can obtain the data points from a figure file

datapointsfigure

I know the answer when we have just one curve , but in my case they are two separate curve . So using this >> H = findobj(f, 'type', 'line'); >> x_data = get (H, 'xdata'); >> y_data = get (H, 'ydata'); give me all the y points together I want y points of each curve seperately.

Best Answer

The H value should be a (2x1) vector. Each handle will give you the x and y data for each curve:

H = findobj(f, 'type','line')
x1data = get(H(1),'XData')
x2data = get(H(2),'XData')
y1data = get(H(1),'ydata')
y2data = get(H(2),'ydata')

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MATLAB: Getting the data point from two plotted curves in one figure

h  = findobj(gca, 'Type', 'line');
x1 = get(h(1), 'XData')
y1 = get(h(1), 'YData')
x2 = get(h(2), 'XData')
y2 = get(h(2), 'YData')

But actually your code should work already. If h contains 2 line handles (does it?), then

h = findobj(gca, 'Type', 'line');
x = get(h, 'XData')

replies a {2 x 1} cell. Now x{1} contains the XData of the first line, x{2} of the 2nd line - and the same for the YData. Therefore I cannot reconsider why you state, that you "get the data points of imag(neff)" only. Why do you think that this is the fact?

[EDITED] Ah, this is not one axes object, but two created by plotyy or yyaxis. Then you do not need gca only, but all line objects:

h = findobj(gcf, 'Type', 'line')

You have to search in the current figure, not in the active axes only. Then your code will work.

By the way: Did you use the debugger to check, what your "h = findobj(gca,'Type','line')" replies?

MATLAB: Scatterplot

You have to dig down a couple of layers to find the data:

h = scatterplot(rand(20,2));
h = get(h,'Children');
h = get(h,'Children');
x = get(h,'xdata');
y = get(h,'ydata');

Best Answer

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MATLAB: Getting the data point from two plotted curves in one figure

MATLAB: Scatterplot

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