Re: Data structures in Octave

[Paul Kienzle]

It is easy enough to build up data structures using cell arrays or 
structure arrays, however for performance, you want to avoid loops as 
much as possible.

So instead of:

        d(1).v = [1,2];
        d(1).s = 3;
        d(2).v = [3,4];
        d(2).s = 7;
        d(3).v = [5,6];
        d(3).s = 12;

        for i=1:length(d), if sum(d(i).v) != d(i).s, i, end; end

you would do:

        c.v=[1,2;3,4;5,6];
        c.s=[3;7;12];

        find(sum(c.v,2) != c.s)

There are plenty of tutorial resources available.  A google search for 
"matlab tutorial" gives 120,000 hits.  Octave is close enough to matlab 
that you should be able to use them.

Paul Kienzle
address@hidden

On May 16, 2004, at 8:30 AM, Sue Stones wrote:

> The documentation seems to be virtually absent on this area, execept 
> to maybe
> imply that these things exist.  So I will have to ask here again.  (I 
> assume
> that there is a limited resorces to produce documentation)
>
> I am looking for a way to associate a vector with a scalar.  eg to 
> associate
> p8 = [4; 2];  t8 = 1.  I need to loop through a list of these pairs 
> and do
> some calculation on the vectors and compare the outcome to the relavant
> scalar.  I am thinking that some data structure  that combined the two
> elements in to a set, and then someway of looping through the sets.
>
> Is there a way of forming these sorts of "unions"?  Or is there some 
> other way
> of dealing with the problem in Octave?
>
> To loop through the full set of pairs do i need to include all the 
> pairs in
> some over arching data structure?
>
> sue
>
>
>
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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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