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ux=(u(x+1,y)-u(x-1,y))/2 , uy=(u(x,y+1)-u(x,y-1))/2 , uxx=u(x+1,y)-2u(x,y)+u(x-1,y) , uyy=u(x,y+1)-2u(x,y)+u(x,y-1) , uxy=(u(x+1,y+1)+u(x-1,y-1)-u(x+1,y-1)-u(x-1,y+1))/4 , convert eqn into matlab code by using finite diffnc schme. u is an image.
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