MATLAB: This MATLAB code for try catch not works properly.

Computer Vision Toolboxerrormatch

    try
        boxPairs = matchFeatures(data1, data2);
    catch
        if boxPairs == 0
            disp('there was an error')
        else
            plot(x,y)
        end
    end
This is the part of my program.
When i run above code, it completely runs without any error. But no operation is happening,. I checked my workspace. I am getting
 boxPairs = 0
but i am not getting anything as disp in command window. What changes needed in program.?

Best Answer

Hi Nimisha,
boxPairs can never be equal to 0. boxPairs is an M-by-2 matrix containing the indices of matched features. However, if no matches were found, then boxPairs is empty. So your error checking should look like this:
boxPairs = matchFeatures(data1, data2);
if isempty(boxPairs)
   disp('No matches found')
else
   plot(x,y)
end
The error you are getting comes from the estimateGeometricTransform, because it is getting empty points, because boxPairs was empty.
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