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

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alpedhuez 2020 年 8 月 15 日
コメント済み: Les Beckham 2020 年 8 月 18 日
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];

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### 回答 (1 件)

Les Beckham 2020 年 8 月 15 日
>> 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
##### 1 件のコメント表示非表示 なし
Les Beckham 2020 年 8 月 18 日
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.

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