Re: arrays (matrices) of structures.

[Paul Kienzle]

Octave does not handle arrays of structures.

You could implement it as a list of structures, using something like:

    b = list
    g.a = 1
    g.c = 2
    b(1) = g
    g.a = 2
    g.c = 4
    b(2) = g

To access the individual elements, e.g., b(2).a, use
    nth(b,2).a

To update an individual element, e.g., b(2).a = 3, use
    g=b(2); g.a = 3; b(2) = g;

To get a slice along a particular field dimension, e.g., y = { b(1:2).a }, use
    y = list;
    for i=1:length(idx), y(i) = nth(b,2).a(i); end

To get at the elements of the slice, e.g., y{2}, use
    nth(y,2)

And so on.

Paul Kienzle
address@hidden

Gabe Foster wrote:

> Hello,
>
>         I'm porting some code from matlab to octave.  I'm not very familier 
> with
> either package, so please pardon my ignorance.  I'll try to keep this short.
>
>         The code I'm porting uses arrays of data structures.  It has lines 
> like:
>         b(1).a = 1.0
>         b(1).c = 2.0
>         b(2).a = 3.0
>         b(2).c = 4.0
>
>         etc.
>
>         Octave 2.0.16 gives a parse error when trying to parse these lines.  
> Is this
> because it does not support arrays (or matrices) of structures?
>
>         Octave 2.1.34 seems to be ok with that syntax, but does not seem to 
> have a
> path variable:
>
>         octave:1> path(path,"/home/gabe/octlib")
>         error: `path' undefined near line 1 column 1
>         error: evaluating index expression near line 1, column 1
>
>         Any help would be appreciated.
>
>         Thank you for you time...
>
>         --> Gabe
> --
>  * J. Gabriel Foster  "We have advanced to new and surprising
>  * Silicon Grail       levels of bafflement" - Lois McMaster Bujold
>  * address@hidden
>
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Octave is freely available under the terms of the GNU GPL.

Octave's home on the web:  http://www.octave.org
How to fund new projects:  http://www.octave.org/funding.html
Subscription information:  http://www.octave.org/archive.html
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