Thread Subject: big arrays with variable dimension sizes

I have a 4d array where sometimes dimension 3 is length 10
and sometimes dimension 3 is length 200.

When I do something like this:

Normalized_Moment_Values(1, 1, :, :), I usually do
squeeze(Normalized_Moment_Values(1, 1, :, :)) to give a
civilized looking result. However, in this case, i get
something that is LEN x 200, and if it happens to be a time
when it is only length 10, i get 190 rows of 0's. Is there
a better way to do this (to remove the 0's or even to store
the whole thing so that it doesn't fill the rest with 0's?)?

Thanks!!

David

Is there no way to do this??

"David Doria" <daviddoria@gmail.com> wrote in message
<fck27u$88o$1@fred.mathworks.com>...
> I have a 4d array where sometimes dimension 3 is length 10
> and sometimes dimension 3 is length 200.
>
> When I do something like this:
>
> Normalized_Moment_Values(1, 1, :, :), I usually do
> squeeze(Normalized_Moment_Values(1, 1, :, :)) to give a
> civilized looking result. However, in this case, i get
> something that is LEN x 200, and if it happens to be a time
> when it is only length 10, i get 190 rows of 0's. Is there
> a better way to do this (to remove the 0's or even to store
> the whole thing so that it doesn't fill the rest with 0's?)?
>
> Thanks!!
>
> David

"David Doria" <daviddoria@gmail.com> wrote in message
<fclsph$509$1@fred.mathworks.com>...
> Is there no way to do this??
>
> "David Doria" <daviddoria@gmail.com> wrote in message
> <fck27u$88o$1@fred.mathworks.com>...
> > I have a 4d array where sometimes dimension 3 is length 10
> > and sometimes dimension 3 is length 200.
> >
> > When I do something like this:
> >
> > Normalized_Moment_Values(1, 1, :, :), I usually do
> > squeeze(Normalized_Moment_Values(1, 1, :, :)) to give a
> > civilized looking result. However, in this case, i get
> > something that is LEN x 200, and if it happens to be a time
> > when it is only length 10, i get 190 rows of 0's. Is there
> > a better way to do this (to remove the 0's or even to store
> > the whole thing so that it doesn't fill the rest with 0's?)?
> >
> > Thanks!!
> >
> > David
>

You mean you want to store variable-length vectors in the
same array? A cell array will do this, see:

http://blogs.mathworks.com/loren/category/cell-arrays/

You can strip zeros using a logical argument, e.g. for
a = cat(1,rand(4,1),zeros(10,1))
then
a = a(a~=0)

Best wishes, S

On Sep 16, 4:04 pm, "David Doria" <daviddo...@gmail.com> wrote:
> I have a 4d array where sometimes dimension 3 is length 10
> and sometimes dimension 3 is length 200.
>
> When I do something like this:
>
> Normalized_Moment_Values(1, 1, :, :), I usually do
> squeeze(Normalized_Moment_Values(1, 1, :, :)) to give a
> civilized looking result. However, in this case, i get
> something that is LEN x 200, and if it happens to be a time
> when it is only length 10, i get 190 rows of 0's. Is there
> a better way to do this (to remove the 0's or even to store
> the whole thing so that it doesn't fill the rest with 0's?)?

I'm not clear if you're trying to fix a display problem
or a storage problem, but perhaps you want to look
into cell arrays, which can have elements of arbitrary
length (in fact, of arbitrary dimension or type).

            - Randy