MATLAB: How to calculate partial derivative

MATLABsimulation

RGB =imread('image.jpg');
hsv= rgb2hsv(RGB);
imshow(hsv);
r1=0.1;
r2=0.85;
i= 0:20:240;
s= 0.0:0.2:1.0;
wgray = 1 - bsxfun(@power, s(:), (r1*(255./(i(:).')).^r2) ); 
P=diff(wgray,s);
i want to calculate partial derivative of wgray w.r.t s and i have applied but getting error in line 9

Best Answer

I would use the gradient function. It returns two matrices, the partial derivatives in each direction of the input matrix, both the same size as the input matrix. You can use one or both of the returned derivative matrices.
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