Extract column from matrix

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SuzieChan
SuzieChan 2019 年 10 月 20 日
編集済み: Stephan 2019 年 10 月 20 日
SuzieChan accidently destroyed her question, by inserting thank you in this part - here is what she asked:
I have a matrix A:
A =
6 9 4
2 3 4
3 5 7
How do i get the 3rd column of this - what i have is:
A = [6 2 3; 9 3 5; 4 4 7]
A2 = (...)
What do i code for A2?

回答 (1 件)

Stephan
Stephan 2019 年 10 月 20 日
編集済み: Stephan 2019 年 10 月 20 日
Do this
A2 = A(:,3)
but note that you did not code the matrix as you wrote:
>> A = [6 2 3; 9 3 5; 4 4 7]
A =
6 2 3
9 3 5
4 4 7
to achieve the matrix A you posted in your question you need:
>> A = [6 9 4; 2 3 4; 3 5 7]
A =
6 9 4
2 3 4
3 5 7
>> A2 = A(:,3)
A2 =
4
4
7

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