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...ython', 'A',A, 'B',B, 'pythoncode', pythoncode) print(A) print(B) print(C) print(D) print(X) This would pass around matrices A and B do some processing and return results. So you could use your old octave/matlab scriptspassing around strings cells, or whatever matrices/stringsor plot some nice figures via matplotlib in python See http://www.shogun-toolbox.org/doc/elwmsinterface.html . Don't even try to run octave from python from octave etc nested. Neither octave, R nor python-numpy nor libshogun supports this :-) Soeren