Creating a submatrix from a matrix

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Bran
Bran 2013-1-8
回答： nabin 2014-5-8
I have a matrix for example; A = {1 3 7; 10 1 2; 11 5 9; 12 2 5] (however, mine is much bigger) And I would like to keep the rows where all the elements in the row are less than or equal to 7 to put into a new submatrix called B. How would I go about this?
Many thanks for any help you can give :)

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José-Luis
José-Luis 2013-1-8
编辑：José-Luis 2013-1-8
A = [1 3 7; 10 1 2; 11 5 9; 12 2 5]
your_mat = A(all(A<=7,2),:);
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José-Luis
José-Luis 2013-1-10
编辑：José-Luis 2013-1-10
(-8/3)<=B2<=(8/3)
is not valid Matlab syntax. You could try instead:
abs(B2) <= 8/3
Bran
Bran 2013-1-14
Many thanks, that worked for me :)

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更多回答（3 个）

Thomas
Thomas 2013-1-8
编辑：Thomas 2013-1-8
A = [1 3 7; 10 1 2; 11 5 9; 12 2 5]
out=A(find(sum(A<=7,2)==size(A,2)),:) % rows with elements <=7
Azzi Abdelmalek
Azzi Abdelmalek 2013-1-8
编辑：Azzi Abdelmalek 2013-1-8
A = {1 3 7; 10 1 2; 11 5 9; 12 2 5};
B=cell2mat(A);
out1=B(B<7);
n=numel(out1);
n1=floor(sqrt(n));
m1=ceil(n/n1);
out=cell(1,n1*m1);
out(1:n)=num2cell(out1)';
B=reshape(out,n1,m1)
nabin
nabin 2014-5-8
I have a matrix A=[1 2 3; 1 2 9; 2 3 4]. I want a matrix B whose column 1 is equal to 1. How can I do this? B=[1 2 3; 1 2 9]

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