[BioC] graph classes: how to combine multiple graphs into a single graph

[Moshe Olshansky]

Hi Paul,

If I understand you correctly, one possibility would be to take a union of
the nodes of the two (or several) graphs, start with an empty adjacency
matrix (or list of edges) and then add all the edges appearing in all the
graphs. Then you should be able to build a graph from that adjacency
matrix (or a list of nodes and a list of edges).

Regards,
Moshe.

> help (package='graph')  describes many methods, but none of those
> mentioned seem to combine two graphs into a third -- perhaps even
> combining attributes along the way.
>
> graph::union looked promising, but is defined such that it only works if
> the nodes in each graph are identical.
>
> Any suggestions?  Perhaps objects of the new multigraph class can be
> constructed from multiple graphs?
>
> Thanks -
>
>  - Paul
>
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