How i can i make the input of interp2 right?

If i type:

[X,Y] = meshgrid(1:5);
[XI,YI] = meshgrid(1:.1:5);
Z = peaks(X,Y);
ZI = interp2(X,Y,Z,XI,YI);

it is fine.

but if i change into

[X,Y] = meshgrid(1:5);
[XI,YI] = meshgrid(1:.1:5);
Z = rand(25);
ZI = interp2(X,Y,Z,XI,YI);

an error occor:

Error using griddedInterpolant
The size of the grid point arrays should match the size of the value arrays.

Error in interp2/makegriddedinterp (line 220)
        F = griddedInterpolant(varargin{:});

Error in interp2 (line 133)
       F = makegriddedinterp(X, Y, V, method);

How to deal with it?

[Walter Roberson]

The problem does not occur for me. What MATLAB version are you using? What size() are X, Y, Z, XI, YI in the two different csses ?

[Image Analyst]

No errors when I run it either. I suspect you didn't re-run the Z line to get a new Z after you changed the meshgrid line.

Answer 1

[Walter Roberson]

With your edited code, in the failing case, your X and Y are each 5 x 5, but rand(25) will be 25 x 25. Try

Z = rand(size(X));