Splitting a matrix into submatrices by value

Question

hey yo 2018-10-11

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/423471-splitting-a-matrix-into-submatrices-by-value

评论： hey yo 2018-10-11

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!

2 个评论
显示无隐藏无

madhan ravi 2018-10-11

编辑：madhan ravi 2018-10-11

Give short example question is not clear . Give an example.

hey yo 2018-10-11

在 MATLAB Online 中打开

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?

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Mischa Kim 2018-10-11

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/423471-splitting-a-matrix-into-submatrices-by-value#answer_340916

编辑：Mischa Kim 2018-10-11

在 MATLAB Online 中打开

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