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http://uk.mathworks.com/matlabcentral/fileexchange/46468-radialavg-zip/content/radialavg.m

I want to restrict the function to only look within certain angles, e.g. 15 degrees either side of the y axis.

The matrix is centred about the axis I think in this function.

I have tried to use conditions which I add to the first line in the for loop such as :

Y/X > some value, which would restrict to a conic section.

But I get the error "Matrix is singular to working precision" and i dont know why. Its probably evident, but I am a beginner rarely use Matlab.

Thanks