how to reduce the matrix dimmension?

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mostafa
mostafa 2014-10-26
评论： Matt J 2014-10-26
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?

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回答（1 个）

Matt J
Matt J 2014-10-26
A=permute(A,[2,1,3,4]);
A=reshape(A,18,[]);
  2 个评论
mostafa
mostafa 2014-10-26
what the first line do? because i just run the reshape command and the answer was the same.
Matt J
Matt J 2014-10-26
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

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