matrix building question

[Matt Funk]

Sorry,

i should have been more specific. Of course there cannot be 'holes':
What i meant was this:

could i, in theory, build a matrix that with the following layout:
rows: 0-249 owned by proc0
rows: 250-499 owned by proc1
rows: 500-749 owned by proc0
rows: 750-999 owned by proc1

or does it have be like such:
rows: 0-499 owned by proc0
rows: 500-999 owned by proc1


matt

On Tuesday 15 December 2009, Barry Smith wrote:
>    No, there cannot be holes in the rows of matrix.
> 
>     Barry
> 
> On Dec 15, 2009, at 4:58 PM, Matt Funk wrote:
> > Hi,
> >
> > i was wondering if it is mandetory that when i populate a parallel
> > matrix,
> > that all rows owned by given processor are continously numbered?
> >
> > I.e. say that a given process owns 500 rows. Could i build the
> > matrix such
> > that the first 250 rows have row numbers: 0-250 and the second 250
> > rows have
> > row numbers, say: 750-1000?
> >
> > Or do they HAVE to be numbered continous, for example: 0-500 or
> > 250-750?
> >
> > I was under the impression that they had to be continously numbered
> > due to the
> > example given on p.55 of the user manual. However, i might have simply
> > misunderstood what it is saying.
> > Also, reading the section on paritioning makes me think that it
> > might be
> > possible to break the numbering up as mentioned above.
> >
> > I hope i am making sense ...
> >
> >
> > thanks
> > matt
>