On Thursday, July 12, 2012 10:08:49 PM UTC-5, François wrote:
>
> On Thu, 12 Jul 2012 19:57:02 kcrisman wrote: 
> > On Thursday, July 12, 2012 10:48:23 PM UTC-4, John H Palmieri wrote: 
> > > Right now CHomP (Computation Homology Project) is an optional spkg for 
> > > Sage (according to a vote in December 2010 
> > > https://groups.google.com/d/topic/sage-devel/HLxXNpykXm8/discussion, 
> > > although the spkg never got moved from the "experimental" directory to 
> the 
> > > "optional" directory). 
> > 
> > What would the disadvantage be to having it be a very good optional 
> spkg? 
>

Not much except for convenience.
 

> >  Other than convenience :) Just curious.   If the chomp interface with 
> > native Sage stuff in this area is fairly rudimentary, as is (maybe?) 
> > implied here, maybe it would be better to wait until it was 
> > better-integrated. 
>

I'm the person most interested in this, I think, and I don't have the 
expertise to integrate it better. So it would be a long wait. I imagine 
that of the possible users of this, most would want to calculate homology 
groups of large simplicial complexes, in which the bottleneck will be the 
actual calculations, not the time spent in the interface between CHomP and 
Sage.
 

> I myself as a software packager have a teeth against chomp upstream. 
> They distribute unversioned tarballs. So the only stuff available from 
> them 
> is the latest. Not a real problem for sage per see. 
>

Yes, that's a problem. They also don't seem to have any release notes or 
change logs. 
 

> The spkg in the experimental repo is at version 20100213 (.p2) while 
> upstream 
> is at 20110818. From past experience sage worked with 20100830 so at least 
> the interface is probably fairly stable. 
>

I downloaded and built the new version a few days ago. At the moment, 
anyway, the optional spkg for Sage only uses a few of the pieces of CHomP, 
and as far as I can tell, those pieces haven't changed in the new version. 
Or if they have changed, they haven't affected the interface, and they 
haven't gotten any faster: homology calculations take the same time with 
the old and the new.

-- 
John

-- 
-- 
To post to this group, send an email to sage-devel@googlegroups.com
To unsubscribe from this group, send an email to 
sage-devel+unsubscr...@googlegroups.com
For more options, visit this group at http://groups.google.com/group/sage-devel
URL: http://www.sagemath.org

Reply via email to