Replace nested loops with a matrix

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Mohammad Ezzad Hamdan
评论： Mohammad Ezzad Hamdan 2021-5-9
I have to optimize this code but i am not sure how to turn it into a matrix.
for i=2:nhx-1
for j=2:nhy-1
U(i,j)= U(i,j)-dt*(Pc(i+1,j)-Pc(i-1,j))/(2*hx);
end
end

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采纳的回答

Bruno Luong
Bruno Luong 2021-5-9
i=2:nhx-1;
j=2:nhy-1;
U(i,j)= U(i,j)-dt*(Pc(i+1,j)-Pc(i-1,j))/(2*hx);

更多回答（1 个）

Dyuman Joshi
Dyuman Joshi 2021-5-9
Unew = zeros(nhx, nhy);
Unew(2:nhx-1, 2:nhy-1)=U(2:nhx-1, 2:nhy-1)-dt.*(P(3:nhx,2:nhy-1)-P(1:nhx-2,2:nhy-1))./(2*hx);
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