Vectorize two for loops

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Master Blabla
Master Blabla 2020-11-19
回答： CHENG QIAN LAI 2020-11-24
How to vectorize this function:
for i=1:100
for j=1:200
TheOne(i,j) = i+j;
end
end

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回答（2 个）

David Hill
David Hill 2020-11-19
编辑：David Hill 2020-11-19
[i,j]=meshgrid(1:100,1:200);
TheOne=reshape(sum((Png1(:,i)-Png2(:,j)).^2),100,[]);
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Master Blabla
Master Blabla 2020-11-19
It does not work correctly
David Hill
David Hill 2020-11-19
Made a mistake. Try this.
[i,j]=meshgrid(1:100,1:200);
TheOne=reshape(sum((Png1(:,i)-Png2(:,j)).^2),200,[])';

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CHENG QIAN LAI
CHENG QIAN LAI 2020-11-24
[i,j]=ndgrid(1:100,1:200);
% 1 2 3 . . . 200
%---------------------------
% i= 1 1 1 . . . 1 | 1
% 2 2 2 . . . 2 | 2
% 3 3 3 . . . 3 | 3
% . . . | .
% . . . | .
% . . . | .
% 100 100 100 . . . 100 | 100
%---------------------------
% j= 1 2 3 . . . 200 | 1
% 1 2 3 . . . 200 | 2
% 1 2 3 . . . 200 | 3
% . . . | .
% . . . | .
% . . . | .
% 1 2 3 . . . 200 | 100
TheOne = i+j;

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