Almost singular matrix with orphaned nodes

Hallöchen!

I get the warning

warning: singular matrix
zeroing nan and inf entries...
warning: (almost) singular matrix! (estimated cond. number: inf)

because I have nodes in the mesh that don't belong to any element. I could get rid of them, however, this would make my postprocessing algorithm more complicated. Can I safely ignore this message?

Tschö, Torsten.

-- Torsten Bronger Jabber ID: torsten...@jabber.rwth-aachen.de or http://bronger-jmp.appspot.com