Dear All, The previous version of get_clifford_comp() was written in obscure and inefficient way. I am attaching a new version which still passes all tests in exam_clifford.cpp ;-) Best wishes, Vladimir -- Vladimir V. Kisil http://www.maths.leeds.ac.uk/~kisilv/ Book: Geometry of Mobius Transformations http://goo.gl/EaG2Vu Software: Geometry of cycles http://moebinv.sourceforge.net/