extract matrix from for loop

조회 수: 8 (최근 30일)
darksideofthemoon101
darksideofthemoon101 2011년 5월 16일
Hi,
I want to extract a 2x2 matrix from each iteration of a for loop. Normally I would use something like
for loop=1:1:10
m=[a b c d];
m2(loop)=m;
end
but this doesn't work because of the increased dimensions. Can anyone help?

채택된 답변

Matt Fig
Matt Fig 2011년 5월 16일
Use cell arrays, or stack along the third dimension.
for loop=1:1:10
m=[a b c d]; % I assume this is only a place-holder for code.
m2{loop}=m; % Notice the curly braces, not parenthesis.
end
Or,
for loop=1:1:10
m=[a b c d]; % I assume this is only a place-holder for code.
m2(:,:loop)=m; % A 3D array. Each page is a matrix
end
Also note, that if your final array m2 will be much larger than this you will definitely want to pre-allocate the space.

추가 답변 (1개)

Sean de Wolski
Sean de Wolski 2011년 5월 16일
m2 = repmat(m,[1 10]);
or
m2 = repmat(m,[10 1]);

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