how to calculate partial derivative

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kalyani ohri
kalyani ohri 2016-2-4
评论： Star Strider 2016-2-6
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

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Star Strider
Star Strider 2016-2-4
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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