[BioC] R hangs when applying johnson.all.pairs.sp (in library RBGL) to some graphs

[Dan Bebber]

Hello,

when I apply johnson.all.pairs.sp to certain graphs, R hangs.
The R window can still be resized, minimized etc. and the "stop current 
computation" button can be pressed (though nothing happens).
The computation can be interrupted by attempting to close R, then pressing 
"cancel" when the "save workspace" dialogue opens. However, R then becomes 
unstable and shuts down without warning.
The error also causes R to shut down occassionally.
I have this problem with 2 of 35 graphs I am analysing.

I can provide an example of a test graph if anyone would be kind enough to 
test this on their system.

System is:
Microsoft Windows XP Pro, SP2
Dual Pentium Xeon processors
2Gb Ram

Software is:
R 2.3.0
RBGL 1.7.10

Many thanks,
Dan Bebber

Department of Plant Sciences
University of Oxford