Re: An array of arrays?

[Quentin Spencer]

In order to insert a variable b between elements 2 and 3 you could use 
the following command:

a={a{1:2},b,a{3}};



Henry F. Mollet wrote:

> I'm beginning to understand what a cell array is about. Assume that I
> constructed a large cell array and that I forgot one item. How do I squeeze
> in an additional item at a specified location, say between a{2} and a{3} in
> the example below without starting from scratch and a{3} will become a{4}?
>
> Also, if
> octave:42> a{3}
> ans = string
> Why is 
> octave:41> a{[3,1]}
> ans =
> (
>  [1] = string
>  [2] = 1
> )
>
> Henry
>
>
>
> on 11/1/04 6:23 AM, Quentin Spencer at address@hidden wrote:
>
>  
>
> > I think a cell array is what you're looking for. Each element of a cell
> > array can have a different type and different dimensions. Cell arrays
> > are indexed using {}. For example:
> >
> > octave:1> a{1} = 1;
> > octave:2> a{2} = [1,1,1];
> > octave:3> a{3} = "string";
> > octave:4> a
> > a =
> >
> > {
> > [1,1] = 1
> > [1,2] =
> >
> >         1        1        1
> >
> > [1,3] = string
> > }
> >
> > I hope this helps.
> >
> > Quentin
> >
> >
> >
> > Vic Norton wrote:
> >
> >    
> >
> > > Here is my problem. I have a subroutine
> > >   [X, S] = solsp(rtns, rtn0, noshort)
> > > that produce a k x n matrix, X, and a k x 1 matrix, S, from a given m
> > > x n matrix, rtns, an m x 1 matrix rtn0, and a (possibly empty)
> > > submatrix, noshort, of [1 : n]. The integers m and n are fixed, but k,
> > > the number of rows of X and S, varies, depending on the data matrices
> > > rtns and rtn0.
> > >
> > > The matrices rtns and rtn0 are actually samples of historical returns
> > > on certain investments ending at a certain week. I would like to run
> > > through a bunch of end-weeks (wk = 1, 2, ..., N) and collect and save
> > > the corresponding [X, S] output. The natural data structure would be a
> > > list [X(wk), S(wk)] (wk = 1, 2, ..., N) of pairs of arrays of varying
> > > row dimensions, k(wk) (wk = 1, 2, ..., N). Is there any reasonably
> > > efficient way to create and save such a data structure in Octave?
> > >
> > > Note, all arrays contain floating point numbers except for the fixed
> > > integer array noshort.
> > >
> > > Any ideas would be greatly appreciated.
> > >
> > > Regards,
> > >
> > > Vic Norton
> > >      



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