Patches up for a basic sparse fp matrix, #7723. That's the very basics, 
and if accepted I can move on to the fancier stuff -- I prefer getting 
corrections of course early...

William Stein wrote:
> I really hope that the Sage matrix design is sufficiently flexible
> that it can be adapted to work for your purposes.  I put a lot of time
> into designing the overall structure so it would at least work for
> what I wanted.
>   

I hope so too. So far my experience is that I like how things are 
designed and what it can do for my own code (basically make it a lot 
cleaner), but there's *a lot* of holes to fill in to make it useful even 
in a basic sense for numerics (also for dense matrices for instance). 
I've seen that there's some more work than I first imagined to make it 
usable for me, but I'm not sure if there are other alternatives (besides 
my own code base being a mess -- which I might go for in the end..). I 
will simply have to start using it and see whether I find it easier to 
drop this or keep evolving it. If the latter, I'd have to supply some 
patches for dense fp matrices too.

Dag Sverre

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