Extract column from matrix

Question

SuzieChan 2019-10-20

编辑： Stephan 2019-10-20

SuzieChan accidently destroyed her question, by inserting thank you in this part - here is what she asked:

I have a matrix A:

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?

Answer 1

Stephan 2019-10-20

编辑：Stephan 2019-10-20

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