Thanks for the reply. But no. The problem is not due to the fact that the function has a singularity. Indeed.
plot(20*log(abs((1+I*x)^4),10),(x,0,3)) fails with the same error which is incomprehensible to me. On the other hand turning the expression into a lambda function made it possible to plot it. Thanks for this practical advice. I wish someone could explain this rationally to me. 20*log(abs((1+I*x)^4),10) seems to be a perfectly fine symbolic expression so IMHO it should be possible to plot it. -- 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
