How can one extract a column based on a value of another column?

I have a two column matrix A. The first column takes a value of 0 or 1. I want to extract the elements of the second column according to the value of the first column. For example,

A = [ 0 1; 1 0; 0 2]; 

Then I want to create

A_0 = [1;  2];

A_1 = [0];

Please advise.

Answer 1

[Les Beckham]

>> A = [ 0 1; 1 0; 0 2];
>> A_0 = A(A(:,1)==0,2)
A_0 =
     1
     2
>> A_1 = A(A(:,1)==1,2)
A_1 =
     0

[Les Beckham]

If this answered your question, you should accept the answer.

If not, you should explain why it did not answer your question. Usually, this requires clarifying your question.

If you continue to ignore the answers to your questions, those of us who have been answering them will begin to ignore your questions.

Have a nice day.