MATLAB: How to get object data from a FIG file, such as X and Y data

datagrabbing datagraphplotxy

i search on matlab searching question but not found it.

I have a graph with a curve. I want to know the Y value from my graph

example X = 10

how to find Y?

thx.

Best Answer

Open the figure using “openfig” and return the “Figure” object as an output argument, such as "fig". Then use “fig” to access the underlying objects in the figure.

 fig = openfig('MySavedPlot.fig')

For example, if the figure contains a line plot, you might want to get the X and Y data for the line. You can get the X and Y data using the XData and YData properties of the "Line" object. You can access the "Line" object through the "Children" property of the axes. You can access the "Axes" object through the “Children” property of the figure.

ax = fig.Children
ln = ax.Children;
X = ln.XData;
Y = ln.YData;

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MATLAB: I need to get the data from this figure

The plot appears to have only Bar objects.

Try this:

F = openfig('untitled.fig');
Ax = gca;
hBar = findobj(Ax.Children, 'Type','Bar');
X = hBar.XData;
Y = hBar.YData;

Finding that took a bit of exploring.

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You must use the contour function to get the contour labels.

Combining fcontour and contour to get the result you want (in figure(2) here) is not difficult. You first need to get the data fcontour creates. You can do that by returning the handle to it, and then accessing its properties.

Using an example from the documentation for fcontour and adapting it to use contour:

syms f(x,y)
f(x,y) = sin(x) + cos(y);
figure(1)
hfc = fcontour(f);
figure(2)
contour(hfc.XData, hfc.YData, hfc.ZData, 'ShowText','on')

Although this takes one more line of code, it will give you the result you want.

Best Answer

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