Dear all, when I do : require "rubygems" require "gsl" #require "gecoder" include GSL a=Vector.alloc([1,2,3]) p a => GSL::Vector[ 1.000e+00 2.000e+00 3.000e+00 ] (as expected) , but requiring "gecoder" also gives p a => Vectornil What could be the reason for that ? Thank you very much. Best regards, Axel -- Psssst! Schon vom neuen GMX MultiMessenger gehöòt? Der kann`s mit allen: http://www.gmx.net/de/go/multimessenger?did=10