Changing the dimensions of a large matrix

I have some data captured from a sensor by way of microsoft excel, the data is in the form of a 2D array, 900 rows and 15360 columns.

each row actually represents a 2d array in itself, and i need to turn the entire thing from a 2d array into a 3d one.

i.e the array is currently:

    1  2  3  4   5  6
    7  8  9  10  11 12
    13 14 15 16  17 18

and needs to be in the format of

    1 2 3
    4 5 6

    7 8 9
    10 11 12

    13 14 15
    16 17 18

I've used the permute funtion to get

    1 2 3 4 5 6 

    7 8 9 10 11 12

    13 14 15 16 17 18

but when i try and use the reshape function on this array i get the following error - Index exceeds matrix dimensions.

Any help will be greatly appreciated.

Answer 1

[the cyclist]

Is this what you mean?

permute(reshape(A',[3 2 3]),[2 1 3])