Re: indexing in octfile

[Brian Blais]

David Bateman wrote:
> Brian Blais wrote:
>
> > what is the equivalent cc code for:
> >
> > m(3:6)=5
> >
> > or
> >
> > m(3:6)=6:8;
> >
> > or
> >
> > m(3:6)=m(3:6)+6:8;
>
>
> The equivalent to index is "assign" which you'll find in ov-base-mat.cc. 
> However, I don't see a case where you should use such an example. Better 
> to write a generic function and do the indexing/assignment exterior to 
> the function eg

Thanks for the response,

I realize that this particular example is not a good use of the octfile 
indexing, but it is simple enough that I can learn how to do the more 
complicated example I am actually interested in.

I've looked at the ov-base-mat.cc cod, and frankly I find it very 
difficult to learn these sorts of things directly from the octave source 
code.  I'm sure this is completely my problem, being somewhat new to 
C++, and very new to the octave classes.

Would you be able to write me a short example of how to use "assign" in 
the examples I list above?  I don't see a version of "assign" which 
takes an idx_vector, or uses the Matrix class, looking at the 
OctaveClassReference documents.

At some point, I hope to be able to know enough to give back to this 
community.  One thing that I think would be useful, and I am working on 
it by necessity, is a collection of simple "hello world"-type programs 
which illustrate the uses of each of the most commonly used octfile 
features.  I've read the prthomas "cookbook" which is enormously 
helpful, but I think there are a few other examples that would be nice 
to have.  If there is someone more experienced who has done this 
already, I'd love to see it.

On a side note, I am coming from years of Matlab experience.  One of the 
things that existed for Matlab, and I was wondering if it exists for 
Octave, is the user contributed m-file database.  It seems as if 
octave-forge is like that, but how do you submit to it?  Is there a more 
informal place for such things?  Sometimes I write a small script or 
function that I think others might find useful, but I don't think is so 
important that it needs to go into a large effort like octave-forge.

Anyway, just a few thoughts.

                        thanks again,


                                        Brian Blais




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