MATLAB Central Newsreader - matrix with matrix for each element

matrix with matrix for each element

Dave Brackett — Tue, 15 Jul 2008 13:42:01 -0400

Hi, I am trying to create a matrix which has a matrix as
each element e.g.:

h=[1:3]'
h(1)=[1,2;3,4]

I then get this message which is understandable:
??? In an assignment A(I) = B, the number of elements in B and
I must be the same.

Is there a way to do this though?
Thanks in advance.

Re: matrix with matrix for each element

John D'Errico — Tue, 15 Jul 2008 13:54:02 -0400

Re: matrix with matrix for each element

David — Tue, 15 Jul 2008 15:29:05 -0400

"Dave Brackett" <davebrackett@hotmail.com> wrote in
message <g5i9f9$eoo$1@fred.mathworks.com>...
> Hi, I am trying to create a matrix which has a matrix as
> each element e.g.:
>
> h=[1:3]'
> h(1)=[1,2;3,4]
>
> I then get this message which is understandable:
> ??? In an assignment A(I) = B, the number of elements
in B and
> I must be the same.
>
>
> Is there a way to do this though?
> Thanks in advance.

you can do 3d arrays, here is a crude example...

m=zeros(3,2,2);
m(1,:,:)=[1,2;3,4];
m(1,:,:)

ans(:,:,1) =
     1 3
ans(:,:,2) =
     2 4

m(2,:,:)
ans(:,:,1) =
     0 0
ans(:,:,2) =
     0 0

m(3,:,:)
ans(:,:,1) =
     0 0
ans(:,:,2) =
     0 0


of course this is restricted to all the sizes being the
same. cells are nicer in some ways, it depends on just
what your requirements are.