How can i seperate columns by comparing the values of first row?

Question

suchismita 2016-5-18

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https://ww2.mathworks.cn/matlabcentral/answers/284709-how-can-i-seperate-columns-by-comparing-the-values-of-first-row

回答： ahsan mahmood 2016-5-18

I have a martix

A=      0     1     0     0     1     1     1     1     1     1
   1     0     0     1     1     1     1     1     1
   1     0     0     1     0     1     1     1     1
   1     0     0     1     1     1     1     1     0
   1     0     0     1     1     1     0     1     1
   1     0     0     1     1     1     0     1     1
   1     0     0     1     1     0     1     1     1
   1     0     0     1     1     1     1     0     0
   1     0     0     1     1     1     1     1     1
   0     0     0     1     1     1     1     1     0
   1     0     0     1     1     1     1     1     1

where, in compare to first row i want to have two separate matrix as B with all values which will have A(1,:)==0 and C with all values which will A(1,:)==1

In other words,from this example i want to separate 1st, 3rd and 4th column in a separate matrix and others in another matrix.

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Answer 1

Andrei Bobrov 2016-5-18

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在 MATLAB Online 中打开

t = A(:,1) == 0;
B = A(:,t)
C = A(:,~t)

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Answer 2

ahsan mahmood 2016-5-18

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https://ww2.mathworks.cn/matlabcentral/answers/284709-how-can-i-seperate-columns-by-comparing-the-values-of-first-row#answer_222534

在 MATLAB Online 中打开

clc;
clear all;
A=[1 1 0;1 2 5;3 6 8;5 4 2];  
j=1;
k=1;
nn=size(A);
for i=1:nn(2)
    if A(1,i)==1
        C(:,j)=A(2:end,i);
        j=j+1;
    else
        B(:,k)=A(2:end,i);
        k=k+1;
    end
end