reducing the m x n value of matrix

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..

Answer 1

[Walter Roberson]

Try

A(1:1250,:)

and

A(1:ceil(end/2),1:ceil(end/2))

Answer 2

[Pinky Incognito]

Thanks.. but can you explain more.

What does A stands for? is it my .mat file?

[Walter Roberson]

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]

Thanks a lot for helping me :)