This is an attempt to ask my previous question more clearly :-) I'm looking for a work-around for the situation where I would normally call parametric_plot (or plot, for that matter) with a function, and in some particular case that function turns out to evaluate to a constant.
For example: sage: def f(a,b): return e^(a+b*I) ....: sage: parametric_plot([real(f(x,1)),imag(f(x,1))], -pi, pi) Works as expected sage: parametric_plot([real(f(x,-1)),imag(f(x,-1))], -pi, pi) Works as expected sage: parametric_plot([real(f(x,0)),imag(f(x,0))], -pi, pi) Gives a page full of errors, which I interpret to mean that there was a problem plotting because imag(f(x,0)) evaluates to a constant. I believe that this is the same issue described in: http://trac.sagemath.org/sage_trac/ticket/2410 But I'm not sure. I notice that: sage: type(imag(f(x,1))) <class 'sage.calculus.calculus.SymbolicArithmetic'> and: sage: type(imag(f(x,0))) <class 'sage.calculus.calculus.SymbolicConstant'> So, perhaps I could use this test (at least in this particular case) to avoid calling parametric_plot and simply draw a line instead. But I wonder if there is a more general strategy. For example, a single test that will tell if a function if going to evaluate to any kind of "constant" that plot or parametric_plot will have a problem with? I'm trying to be as clear as I can about this. I'm very new to Sage, and I realize that I could be missing something obvious. -Mike --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~----------~----~----~----~------~----~------~--~---
