How to get data from figure?

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Deniz
Deniz 2013-11-10
回答： Walter Roberson 2013-11-11
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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采纳的回答

Walter Roberson
Walter Roberson 2013-11-11
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

更多回答（2 个）

dpb
dpb 2013-11-10
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.
Deniz
Deniz 2013-11-10
this solution doesn't work for me.
plot(rand(1,3))
xdat=get(get(gca,'children'),'xdata')
ydat=get(get(gca,'children'),'ydata')
xvec=linspace(1,3,0.1)
y=ydat(ismember(xdat,xvec))
what i get:
xdat =
1 2 3
ydat =
0.0462 0.0971 0.8235
xvec =
Empty matrix: 1-by-0
y =
Empty matrix: 1-by-0
I need the y-vector for a x-vektor:xvec=linspace(1,3,0.1)
Any other ideas?
Thanks
  1 个评论
Walter Roberson
Walter Roberson 2013-11-11
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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