How to extract array from the mean directly using indexing?

A = [2.29441228002842 17.3351873969651 2.79928860040389 7.17554281085515;

3.16200415659481 16.9975006219209 3.18395042061777 7.45747601536461;

4.55387378846938 13.4948344868957 3.22594708715312 7.49001605579868]

meanA = mean(A,1)

output: [3.3368 15.9425 3.0697 7.3743]

how can i get second element of mean in one line?

ex:

mean(A,1)(2)

• (2) is index

But, it is not working. Thanks.

Answer 1

[Nikhil Baishkiyar]

A = [2.29441228002842	17.3351873969651	2.79928860040389	7.17554281085515;
3.16200415659481	16.9975006219209	3.18395042061777	7.45747601536461;
4.55387378846938	13.4948344868957	3.22594708715312	7.49001605579868]

A = 3×4

2.2944 17.3352 2.7993 7.1755 3.1620 16.9975 3.1840 7.4575 4.5539 13.4948 3.2259 7.4900

mean(A(:,2))

ans = 15.9425

You mean something like this?

subindex = @(matrix, r) matrix(r);     % An anonymous function for indexing
value = subindex(mean(A,1), 2)  % Use the function to index the vector

value = 15.9425

[Nikhil Baishkiyar]

Indexing into a function call is pretty difficult, this would be easier to do. If you are determined, I found this post where they want to do the same thing

[William]

Yeah.. But we only got second column. It seems we will use mean four times. if there is thousands?

Actually, all of data is needed. and indexing is what can solve the problem and can ellimitate the time complexity. or we can use two lines to make the mean variable.

[Nikhil Baishkiyar]

I read the post and updated my answer based on that. If you want every mean value you will have to store it in a temporary variable I am afraid