Hello, John, thank you for your answer! I must have missed the mail about thread update, sorry for late reply.
I will think about your solution. Nick -- To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org