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## Re: multi-dimensional matrix

**From**: |
Nathan Weisz |

**Subject**: |
Re: multi-dimensional matrix |

**Date**: |
Tue, 19 Aug 2003 08:43:23 +0200 |

Hi Weijun,
I just asked the same question a couple of days ago.

`http://www.octave.org/octave-lists/archive/help-octave.2003/
``msg01339.html
`Got no answer however. :-(
So when I try this (as I would in Matlab) ...
octave:34> a=rand(2)

a =
0.493654 0.072149
0.024741 0.886199
octave:35> a(:,:,2)=rand(2)

... I get following error message:

error: invalid number of indices (3) for indexed assignment
error: assignment failed, or no method for `matrix = matrix'
error: evaluating assignment expression near line 35, column 9

`So my non-expert guess is: no, a multi-dimensional matrix does not
``work. But Perhaps someone else more experienced could comment on that.
`

`Don't know if it helps you, but I temporarily solved my problem using
``cells instead.
`

octave:36> b=cell(1,2); %define size of cell
octave:37> b{1,1}=rand(2);
octave:38> b{1,2}=rand(2);
octave:39> whos
*** local user variables:
prot type rows cols name
==== ==== ==== ==== ====
rwd cell 1 2 b
octave:45> b
b =
{
[1,1] =
0.70743 0.84567
0.33874 0.35939
[1,2] =
0.84809 0.51944
0.62300 0.88953
}

`Yet operations over e.g. a third dimension (e.g., Matlab: mean(a,3)),
``would be a little bit awkward and would need something like a "for i =
``1:..."-statement. Or am I wrong??
`
Best,
Nathan
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