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Re: Sparse functions for octave

From: A+A Adler
Subject: Re: Sparse functions for octave
Date: Sat, 13 Nov 1999 22:38:51 -0500 (EST)

On Fri, 29 Oct 1999, John W. Eaton wrote:
> I'd rather say it was just an incomplete example.
> You can get the other operators if you add the following code:
> [ code snipped ]

Great, thanks. I've got UNOPS working and also have
full( sparse_matrix ) working using the get_rep member 
function in 2.1.19.

Now, I need to add indexing to sparse matrices, to that you can

x(1:2,1:2) for sparse x.

I've defined member functions:

octave_value octave_sparse::index (idx_vector colv, idx_vector rowv ) ;


octave_value octave_sparse::extract (int r1, int c1, int r2, int c2) ;

but this doesn't seem to work.

octave-2.1.19:3> x=make_sparse(eye(5));
   installing sparse type at type-id = 18
   DEBUG:sparse( SuperMatrix A)
   DEBUG:sparse destructor
octave-2.1.19:4> x(1:2,1:2)
   error: can't perform indexing operations for sparse type

What is the right way to do this?

( Initially, I only need extract submatrices, but, eventually,
  I'll need to be able to assign to them too)

Andy Adler,                               address@hidden

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