Split a larger matrix into smaller matrices

Hello All,

I have a [256 x 5 x 2000] matrix. I want to split this matrix into 5 [256 x 1 x 2000] matrices. Tried using mat2cell but it returns an error stating number of dimensions must match.

Could anyone please help me with this?

Thanks, \Kashif

Answer 1

[Star Strider]

The dimensions have to add to the same values in each dimension with mat2cell.

This works:

M = randi(9, 256, 5, 2000);                                         % Create Matrix
C = mat2cell(M, 256, ones(1,5), 2000);                              % Split To Cells

[Kash022]

Thanks. so now how do I access the individual matrices because C is now 1x5 cell?

[Andrei Bobrov]

C{1} - first matrice, C{2} - second and so on

[Kash022]

Yes, I am trying this command and its returning me "error using plot, invalid first data argument"

plot(squeeze(K{1}(1,1,:)),'r');

[Star Strider]

I’m not certain what you want to plot.

See if this does what you want:

plot(squeeze(C{1}))

[Kash022]

@Star Strider: Yeps this works...even if I do plot(squeeze(C{1}(1,1,:))); Thanks!

[Star Strider]

My pleasure!

Answer 2

[Andrei Bobrov]

C = num2cell(M,[1 3]);

[Kash022]

Thanks but while doing plot(squeeze(K(1,1,:))); gives me an error.

[Andrei Bobrov]

What is K? It is C?

[Kash022]

C = mat2cell(My_matrix, 256, ones(1,5), 2000);
K = num2cell(C,[1 5]);

[Stephen23]

@ksnf3000: why are you using both num2cell and mat2cell? None of the answers do this. mat2cell splits up your array into pieces and returns a cell array... why do you want to split this up as well? You only need one of them.

[Kash022]

@Stephen Cobeldick: Yes , your right...can use any one. Thanks once again!