The connected components algorithm uses a color map for internal storage. If you don't supply a color map, it tries to build a default color map using the vertex index property. That's where this is failing: when the vertex list type is listS, there is no default vertex_index property, so the code fails.
Is there any way I could have known that from the documentation? I mean,
Thanks a lot for your help! But (just in order to learn more about my beloved BGL): this is by no means an accusation, but I'd just like to be able to learn to work through the BGL without having to anoy the list with lots of question. I still think that I missed something. If this is so, please let me know. By the way: BGL saved me so much time... I can't even tell you... all the best Martin -- ----------------------------------------------------------------------------- Martin Okrslar MPI for Molecular Genetics phone: ++ 49 + 30 / 8413-1166 Computational Molecular Biology Fax: ++ 49 + 30 / 8413-1152 Ihnestrasse 73 email: okrslar@molgen.mpg.de D-14195 Berlin URL: http://cmb.molgen.mpg.de -----------------------------------------------------------------------------