How to get data from figure?
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Hi,
I have a curve figure. How can i get the y-data (vector) for given x=linspace(0,R,c) out of figure?
Thanks
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Accepted Answer
Walter Roberson
on 11 Nov 2013
xd = get(get(gca,'children'),'xdata'); % return the plot data
yd = get(get(gca,'children'),'ydata');
x = 1 : 0.1 : 3; %places to sample at
y = interp1(xd, yd, x); %interpolate from stored data at locations to be sampled
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More Answers (2)
dpb
on 10 Nov 2013
x = get(get(gca,'children'),'xdata'); % return the plot data
y = get(get(gca,'children'),'ydata');
y=y(x(x==linspace(0,R,c)));
Trivial example from keyboard to illustrate...
>> plot(rand(1,3))
>> xdat=get(get(gca,'children'),'xdata');
>> ydat=get(get(gca,'children'),'ydata');
>> xvec=linspace(0,1,2);
>> y=ydat(ismember(xdat,xvec))
y =
0.8147
>>
You'll get some other value depending on state of rng at the time but the process should be clear to retrieve the data from the plot and find a location.
NB that if your x values are non-integer values you may need to make the comparison "fuzzy" rather than exact as is shown here.
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Deniz
on 10 Nov 2013
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Walter Roberson
on 11 Nov 2013
The last argument to linspace() needs to be a count, not an increment. Use ":" if you want an increment
1 : 0.1 : 3
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