reducing the m x n value of matrix

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Pinky Incognito
Pinky Incognito 2011-3-18
Hi,
I have a matrix of 2500 x 56,
and I need to reduce the value to be half, i.e: 1250 x 56 or 1250 x 28
It's not that I want to compress the value, but I want the other 1250 just to be taken out. Meaning, i want my first 1250 original value. I hope i make sense here..
The matrix value is being save in data_all.mat.
Does anyone know how to access the row and column value?
I know about principal component analysis, but that is not what I want to do.
Thanks for the help..

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Walter Roberson
Walter Roberson 2011-3-18
Try
A(1:1250,:)
and
A(1:ceil(end/2),1:ceil(end/2))

更多回答（1 个）

Pinky Incognito
Pinky Incognito 2011-3-18
Thanks.. but can you explain more.
What does A stands for? is it my .mat file?
  2 个评论
Walter Roberson
Walter Roberson 2011-3-18
A is your matrix. load() your matrix from your .mat file if you need to. save() the reduced matrix back to your .mat file if you want to (but it's a good idea to save it to a _different_ .mat file until you are sure that everything worked and that you don't need the original data any more.)
Pinky Incognito
Pinky Incognito 2011-3-18
Thanks a lot for helping me :)

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