plotting griddata

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Melissa 2011-5-25

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https://ww2.mathworks.cn/matlabcentral/answers/8199-plotting-griddata

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

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Matt Fig 2011-5-25

I think you mean MESH, not MESHGRID.

Melissa 2011-5-25

As I am trying to implement in a GUI the command window will not be available. When I plug this code into each if statement (ie linear, cubic, nearest) I only receive a plot of the points and not of the generated surfaces. Any suggestions?

%Plotting Griddata

plot3(x,y,z,'o')

hold on

[X,Y]=meshgrid(xi,yi);

surf(X,Y,zi)

hold off

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采纳的回答

Matt Fig 2011-5-25

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https://ww2.mathworks.cn/matlabcentral/answers/8199-plotting-griddata#answer_11281

在 MATLAB Online 中打开

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

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.

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Walter Roberson 2011-5-26

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 2011-5-26

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.

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Walter Roberson 2011-5-25

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/8199-plotting-griddata#answer_11280

在 MATLAB Online 中打开

[X,Y] = meshgrid(xi,yi);
Z = griddata(x,y,z,X,Y);
mesh(X,Y,Z), hold
plot3(x,y,z,'o'), hold off

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Melissa 2011-5-25

that only works in the command window.

Walter Roberson 2011-5-25

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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