plotting griddata
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Hey All, I was wondering if there was a way to modify the griddata program to include plotting. Given that I am using data points I know I will have to use meshgrid and was trying to figure out how it would be possible to include into the program. Any ideas? Mel
3 Comments
Accepted Answer
Matt Fig
on 25 May 2011
From the doc:
x = rand(100,1)*4-2;
y = rand(100,1)*4-2;
z = x.*exp(-x.^2-y.^2);
ti = -2:.25:2;
[XI,YI] = meshgrid(ti,ti);
ZI = griddata(x,y,z,XI,YI);
mesh(XI,YI,ZI), hold
plot3(x,y,z,'o'), hold off
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EDIT
So do this:
>> edit griddata % Once the file is up, do this:
ctrl+a,ctrl+c,ctrl+n,ctrl+v,ctrl+s % I recommend using mygriddata
Then look in the new file, and find the last switch statement of the main function. Immediately after that switch statement, put this:
mesh(xi,yi,zi)
hold on
plot3(x,y,z,'o')
hold off
Or whatever you want.
11 Comments
Walter Roberson
on 26 May 2011
I still say it was the wrong approach. If you were going to create a new function, why not create a function that contained the lines I showed and which called the unmodified griddata() ?
Matt Fig
on 26 May 2011
That is how I would do it, Walter. But making a custom function from a built-in is o.k. too, I think. I have done so in the past. The thing to avoid is altering the MATLAB version.
More Answers (1)
Walter Roberson
on 25 May 2011
[X,Y] = meshgrid(xi,yi);
Z = griddata(x,y,z,X,Y);
mesh(X,Y,Z), hold
plot3(x,y,z,'o'), hold off
2 Comments
Walter Roberson
on 25 May 2011
Perhaps we are misunderstanding each other, but there is no reason why the code I show above would not work in a script or function, including a callback function.
At most it might be necessary to be more careful about which axes to plot on to.
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