how to extract large number of data points from 2D plot
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I want to extract large number of data points, like 30000 data ponits or more from 2d plot. Is it possible in matlab ?How to do it ?. These points will be used for other purpose but not for plotting. Thats why want large number of data points .
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Adam Danz
il 12 Set 2020
Modificato: Adam Danz
il 14 Set 2020
If you can reproduce the figure, just save the coordinates in addition to plotting them,
plot(x,y,'o')
save('coordinates.mat','x','y')
If you only have the .fig file and need to extract the coordinates, open the file so it's the current figure,
fig = gcf();
ax = gca(fig);
chil = ax.Children;
x = get(chil,'XData');
y = get(chil,'YData');
z = get(chil,'ZData');
x,y,z, will be vectors if only 1 set of data are plotted on the axes. If more than 1 object is plotted, x,y,z will be a n*1 cell array for n objects.
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Ameer Hamza
il 12 Set 2020
If instead of a fig file, you have an image, you can use this package to extract the data points: https://www.mathworks.com/matlabcentral/fileexchange/7173-grabit
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Adam Danz
il 16 Set 2020
I haven't used that function but if it doesn't allow the user to specify the sampling rate, you can certainly interpolate the values it extracts.
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