Slicing in sparse

[Kim Hansen]

On Dec 4, 2007 12:13 PM, David Bateman <David.Bateman at motorola.com> wrote:
>
> octave:3> x=ones([2 0]); x(1)=2
> error: A(I) = X: unable to resize A
> error: assignment failed, or no method for `matrix = scalar'
> error: evaluating assignment expression near line 3, column 20
> octave:3>  x=sparse(ones([2 0])); x(3,:)=2
> x = Compressed Column Sparse (rows = 3, cols = 0, nnz = 0)
>
> octave:4>  x=ones([2 0]); x(3,:)=2
> x = [](3x0)
> octave:5>  x=sparse([]); x(3,:)=2
> x =
>
> Compressed Column Sparse (rows = 3, cols = 1, nnz = 1)
>
>   (3, 1) ->  2
>
> which duplicates the matlab behavior.

But is that a behaviour we want duplicated in Octave?

I think it is dangerous to have different rules for sparse and full
matrices combined with the auto conversion from sparse to full.

-- 
Kim Hansen
Vadgårdsvej 3, 2.tv
2860 Søborg
Fastnet: 3956 2437  --  Mobil: 3091 2437