how to reduce the matrix dimmension?

Hi all

I have a EEG data which is a 4D matrix with this size

ans =

          36          18          10        2560

36: Persons

18: Channels

10: Times the test repeat

2560: Data sampled by 512 Hz for 5S

Now I want just a 2D matrix with channels in rows and data in columns. how can I reduce the dimension?

[mostafa]

I have to add this what if I want just the first person ?

Answer 1

[Matt J]

 A=permute(A,[2,1,3,4]);
  A=reshape(A,18,[]);

[mostafa]

what the first line do? because i just run the reshape command and the answer was the same.

[Matt J]

You should never have to ask what a command does. You have the "doc" and "help" commands. You also have online documentation,

http://www.mathworks.com/help/matlab/ref/permute.html