Re: type of sort(sparse(...))

[Søren Hauberg]

David Bateman skrev:
> Søren Hauberg wrote:
> > David Bateman skrev:
> > > Could someone who has a recent copy of matlab tell me what
> > >
> > > a = sort (sprand(10,10,0.2));
> > > whos a
> > >
> > > gives? In Octave this converts the sparse matrix to a full one, whereas
> > > I suspect in matlab it might not.
> > Matlab  Version 7.4.0.129 (R2007a):
> >
> > > > a = sort (sprand(10,10,0.2));
> > > > whos a
> >   Name       Size            Bytes  Class     Attributes
> >
> >   a         10x10              248  double    sparse
>
> Now that I think about it, what does
>
> [a, i] = sort (sprand (10,10,0.2))
> whos i
>
> give.. For good measure note I ask what the values of a and i are.. My
> worry here is that as a is sparse above, I don't see how i can be and so
> it makes no sense to do an indexed sort of a sparse matrix..
>> [a, i] = sort (sprand (10,10,0.2));
>> whos
  Name       Size            Bytes  Class     Attributes

  a         10x10              284  double    sparse
  i         10x10              800  double

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