#8372: split up incidence_matrix() over graph.py and digraph.py
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Reporter: mvngu | Owner: rlm
Type: enhancement | Status: new
Priority: major | Milestone: sage-4.3.4
Component: graph theory | Keywords:
Author: | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
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From [http://groups.google.com/group/sage-
devel/browse_thread/thread/b9e4114047427c2e sage-devel]:
{{{
For discussion purposes, let me toss out some ideas on improving the
interface for computing incidence matrices. For a graph object G, I
propose we add a keyword to G.incidence_matrix() so that the interface
is now changed to the following method signature:
def G.incidence_matrix(orientation=False)
The keyword "orientation" takes on a Boolean value. So
G.incidence_matrix(orientation=False) or G.incidence_matrix() returns
the unoriented incidence matrix of an undirected graph G. Furthermore,
G.incidence_matrix(orientation=True) returns the oriented incidence
matrix of an undirected graph G, which is the current behaviour. The
keyword "orientation" has no effect if G is a digraph. So
"orientation" is only meant to affect undirected graphs.
Let's consider whether or not to leave the method incidence_matrix()
in the module generic_graph.py. I consider it more appropriate for
graph.py (a module for undirected graphs) to deal with incidence
matrices for undirected graphs. Similarly, digraph.py can deal with
incidence matrices for digraphs. At the moment, incidence_matrix()
resides in generic_graph.py, a module with over 10 thousand lines.
}}}
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/8372>
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