#11880: ISGCI in Sage (a Graph Classes database http://www.graphclasses.org/ )
----------------------------+-----------------------------------------------
Reporter: ncohen | Owner: jason, ncohen, rlm
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-4.7.2
Component: graph theory | Keywords:
Work_issues: | Upstream: N/A
Reviewer: | Author: Nathann Cohen
Merged: | Dependencies:
----------------------------+-----------------------------------------------
Description changed by ncohen:
Old description:
> This ticket creates a file
>
> {{{
> sage/graphs/isgci.py
> }}}
>
> That is a *first implementation* of an interface between Sage and the
> Graph Classes database ISGCI [1]. With this interface, the XML content of
> the database can be read using dictionaries and lists (much easier to
> work with), and some operations are implemented like the comparison
> (relatively to inclusion) of graph classes.
>
> There will be more work needed on this new feature, for instance the
> implementation of an easy way to query the database.
>
> Along with the patch, two .sobj files should be added to the directory
> ``SAGE_ROOT/data/graphs/``. These files are a .sobj version of the
> database, that I created on my own computer.
>
> When this patch will be merged to Sage, it is likely that users that do
> not update their version of Sage will progressively then be working with
> an outdated version of the database, as the version will be the one used
> the day they downloaded their copy of Sage. To avoid that, this patch
> implements a function ``sage.graphs.isgci.update_db`` that downloads a
> new version of the database from ISGCI's website and updates the current
> .sobj files.
>
> Hence, instead of using my two files attached to this ticket, one can
> also call this method which will create them automatically.
>
> I tried to make the documentation clear enough about all that is
> currently possible with ISGCI.
>
> Apply: [attachment:trac_11880.patch]
>
> Nathann
>
> [1] http://www.graphclasses.org/
New description:
This ticket creates a file
{{{
sage/graphs/isgci.py
}}}
That is a *first implementation* of an interface between Sage and the
Graph Classes database ISGCI [1]. With this interface, the XML content of
the database can be read using dictionaries and lists (much easier to work
with), and some operations are implemented like the comparison (relatively
to inclusion) of graph classes.
There will be more work needed on this new feature, for instance the
implementation of an easy way to query the database.
Along with the patch, two .sobj files should be added to the directory
``SAGE_ROOT/data/graphs/``. These files are a .sobj version of the
database, that I created on my own computer.
When this patch will be merged to Sage, it is likely that users that do
not update their version of Sage will progressively then be working with
an outdated version of the database, as the version will be the one used
the day they downloaded their copy of Sage. To avoid that, this patch
implements a function ``sage.graphs.isgci.update_db`` that downloads a new
version of the database from ISGCI's website and updates the current .sobj
files.
Hence, instead of using my two files attached to this ticket, one can also
call this method which will create them automatically.
I tried to make the documentation clear enough about all that is currently
possible with ISGCI.
Apply: [attachment:trac_11880.patch]
One of the discussions on Sage-devel related to this database :
https://groups.google.com/forum/#!searchin/sage-
devel/This$20is$20the$20copy$20of$20several$20mails$20concerning$20ISGCI$20and$20what$20we$20could$20do$20with
/sage-devel/N05a9w_UrIA/XGlVD7NT7p4J
Nathann
[1] http://www.graphclasses.org/
--
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/11880#comment:2>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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