Re: Multidimensional matrix

[David Grundberg]

Alberto Frigerio wrote:
> Hi everyone, I've some questions about multidimensional matrix.
>
> *) It is possible to create (maybe using a list) a multidimensional matrix
> A, i.e. every element of A is not a number but a couple, triplet, etc. of
> numbers ?
> *) How can I multiply two multidimensional matrices ?
>
> Thanks everybody,
>    Alberto
>   

To create 3x3x8 double matrices, use something like:

A = [1 2 3; 4 5 6; 7 8 9];
A = repmat(A, [1, 1, 8]);
A

B = eye(3);
B = repmat(B, [1, 1, 8]);
# To make it more interesting, use indexing to change certain elements:
B(2,:,1:2) = 10;
B(2,:,3:4) = 100;
B(1,[1 3],5:6) = 1000;
B(1,[1 3],7:8) = 10000;
B(2,2,1:4) = -1;
B

#And to do element multiplication you could use the .* operator:
A .* B

hth
David