How to get data from figure?

Question

Deniz 2013-11-10

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/105558-how-to-get-data-from-figure

回答： Walter Roberson 2013-11-11

采纳的回答： Walter Roberson

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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Answer 1

Walter Roberson 2013-11-11

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https://ww2.mathworks.cn/matlabcentral/answers/105558-how-to-get-data-from-figure#answer_114805

在 MATLAB Online 中打开

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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Answer 2

dpb 2013-11-10

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/105558-how-to-get-data-from-figure#answer_114737

在 MATLAB Online 中打开

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.