When I try the following: sage: x,y = var('x,y') sage: region_plot(1/x + 1/y > 1/x * 1/y, (x,-10,10), (y,-10,10)).show ()
I get an error (the last line of the Traceback is reproduced below): TypeError: reduce() of empty sequence with no initial value This error occurs in both the notebook and at the Sage prompt. I found this in versions 4.1.2 to 4.3, but I don't know about the versions before 4.1.2. Interestingly, the following commands work: sage: region_plot(1/x + 1/y < 1/x * 1/y, (x,-10,10), (y,-10,10)).show () # '>' changed to '<' sage: implicit_plot(1/x + 1/y == 1/x * 1/y, (x,-10,10), (y,-10,10)).show() I'm not very proficient at using Sage, so I appreciate any ideas and advice. Tianwei -- 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