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Splitting a matrix into submatrices by value

hey yo 님이 질문을 제출함. 11 Oct 2018
최근 활동 hey yo 님이 댓글을 추가함. 11 Oct 2018
Hello, I have a 10000x3 matrix called A. The 3rd column of the matrix consists of 0s and 1s. I want to create 2 submatrices where A1 collects all rows of A that has a 1 in the 3rd column. A2 should collect the rest of the columns. How can I do that? Thanks!

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Give short example question is not clear . Give an example.
if true
A= [1 2 0; 3 4 0; 4 5 1; 4 7 0; 5 5 1]
end
I want to create
if true
A1=[4 5 1; 5 5 1] and A2=[1 2 0; 3 4 0; 4 7 0]
end
Now suppose that I have thousands of rows. How can I split the matrix A based on the 3rd column values?

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답변 수: 1

Answer by Mischa Kim
on 11 Oct 2018
Edited by Mischa Kim
on 11 Oct 2018
 Accepted Answer

Something like this?
A = [2 3 0 3;...
3 2 1 3;...
2 2 1 2]
A =
2 3 0 3
3 2 1 3
2 2 1 2
A1 = A(A(:,3)==1,:)
A1 =
3 2 1 3
2 2 1 2
A2 = A(A(:,3)==0,:)
A2 =
2 3 0 3

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Excellent! Thank you.

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