Re: Dispatch function

[Julien Bect]

Le 14/05/2016 18:38, pritika malhotra a écrit :
> On 14 May 2016 at 21:54, Julien Bect <address@hidden> wrote:
> > Le 14/05/2016 17:18, pritika malhotra a écrit :
> > > Hello! I was trying to use this given example from documentation and as this 
> > > function is no longer available.
> > > Then what will be the replacement of "dispatch ("sin", "spsin", "sparse 
> > > matrix");"
> > >
> > > Through earlier discussion, I have come to know that we can define classes. How 
> > > can we do that?
> > > A simple illustration if possible Or is there some other to do so.
> > >
> > > function y = spsin (x)
> > >     printf ("Calling spsin\n");
> > >     fflush(stdout);
> > >     y = spfun ("sin", x);
> > > endfunction
> > >
> > > dispatch ("sin", "spsin", "sparse matrix");
> > > y0 = sin(eye(3));
> > > y1 = sin(speye(3));
> >
> > Here is the relevant section of the manual:
> > https://www.gnu.org/software/octave/doc/v4.0.0/Creating-a-Class.html#Creating-a-Class
> >
> > I don't know if you can do it for sparse matrices...
> Thanks.
> Yes, I went through this manual.
> So in order to use the same function I need to create class of the same name.
> I just wanted to know if we have any default classes already existing in octave?

Yes, for instance: struct, double, cell...

If you create a directory named @struct and a function @struct/toto.m 
inside it, then

toto (x)

will call @struct/toto.m if x is a struct.

But sparse matrices (such as speye(3)) are simply of class double, so I 
don't think you can achieve what you want.