MATLAB: How do you prepare meshgrids for interp2

theta-phi interp2 question - hover sphere

I have : theta = 0:5:180; phi = -180:5:180; size(temp) is 37×73; tp = 90;rp = 0; Vq = interp2(thetaprime,phiprime,temp,tp,rp); gives the error: Error using griddedInterpolant The grid vectors do not define a grid of points that match the given values.

Error in interp2>makegriddedinterp (line 211) F = griddedInterpolant(varargin{:});

Error in interp2 (line 126) F = makegriddedinterp({X, Y}, V, method,extrap);

Error in Add_Rings_Spots_To_Bullwink_Data_File (line 67) Vq = interp2(thetaprime,phiprime,temp,tp,rp); I've looked at the help and tried using meshgrid, but I am lost as to why this does not work. I would be greatful for any help. Thank you.

Best Answer

The documentation for Interpolating Gridded Data explains it better than I can.

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MATLAB: Smooth a grid horizontally using interp2

Did you make a mistake in the names of the input to interp2. I would have thought the correct call would be:

Vq = interp2(vbx, vby, bRMS, Xq, Yq);

If not, you need to explain what vX and vY are as they clearly are not what interp2 expects.

MATLAB: How to interpolate with function interp2 with longitude and latitudes coordinates

Error using griddedInterpolant
Interpolation requires at least two sample points in each dimension.

Your X and Y matrix have only 2 values (in one dimension)

X= [-97.3750 -97.1250];
Y= [22.3750 22.3750];
[X1,Y1] = meshgrid(X,Y);                % now they are 2D matrices (2 values in each dimension)
lat=[22.3623 22.3623];
lon=[-97.3500 -97.3500];
V=[0.1085 .0693];                       % has to be 2D matrix also (the same size as X or Y)
Vq= interp2(X,Y,V,lon,lat,'lineal');

Best Answer

Related Solutions

MATLAB: Smooth a grid horizontally using interp2

MATLAB: How to interpolate with function interp2 with longitude and latitudes coordinates

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