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can anyone please explain me this code ..exactly whats happening here while computing curvature ?

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nivedita
nivedita 2014-4-16
编辑： nivedita 2014-4-16
function k = curvature_central(u)
% compute curvature
[ux,uy] = gradient(u);
normDu = sqrt(ux.^2+uy.^2+1e-10);
Nx = ux./normDu;
Ny = uy./normDu;
[nxx,junk] = gradient(Nx);
[junk,nyy] = gradient(Ny);
k = nxx+nyy;

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