Cutting rows and columns from a matrix

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Franco
Franco 2011-2-10
If A = [0,0,0,0;0,0,0,0;0,0,1,1;0,0,1,1], how can i cut out the null comumns and rows to acheive B = [1,1;1,1]

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Jos (10584)
Jos (10584) 2011-2-10
See ANY (or ALL). You need a two step approach:
A = [1 0 1 0 ; 1 0 1 0 ; 0 0 0 0]
B = A(any(A,2),:) ; % remove null rows
B = B(:,any(A,1)) % remove null columns

更多回答（1 个）

Andrei Bobrov
Andrei Bobrov 2011-5-20
B = zeros(sum(any(A,2)),sum(any(A)));
B(:)=A(A~=0);

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