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14 lines
271 B
Matlab
14 lines
271 B
Matlab
function du=duxy(U0,D,CC)
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% compute the emperical derivative WR to the elements of Ue
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delta=0.00001;
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ll0=LL(U0,D,CC);
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for i=1:length(U0),
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for j=1:length(U0),
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Utmp=U0;
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Utmp(i,j)=Utmp(i,j)+delta;
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llij=LL(Utmp,D,CC);
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du(i,j)=(llij-ll0)/delta;
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end;
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end;
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