Compute image gradient in specific region

2015 11 18
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There is a binary mask representing specific region. I want to compute gradient and divergence only in this specific region. My gradient code is following:
ux = circshift( u_bar, [0 -1]) - u_bar;
uy = circshift( u_bar, [-1 0]) - u_bar;
ux(:,end) = 0; uy(end,:)=0;
I know the indices for the region
idxMask = find(R==1);

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