Hi, I'm a long time Mathematica user who just discovered Sage a couple
of months ago, and I'm starting to warm up to it. I have a question
about parametric_plot.

It appears that if you've got a function that evaluates to zero, then
parametric_plot won't accept it. For example, if z(a,b)=e^(I*b + a)
then this seems to be OK:

show(animate([parametric_plot((real(z(x,b)), imag(z(x,b))), 0, 1) for
b in srange(pi/6, 2*pi/6, pi/24)]))

But if I do this:

show(animate([parametric_plot((real(z(x,b)), imag(z(x,b))), 0, 1) for
b in srange(-pi/6, 2*pi/6, pi/24)]))

I have a problem, which (I *think*) is because the imaginary part of
z(x,b) evaluates to zero during the animation.

And so, perhaps, this is related to Ticket #2410. On the other hand,
it could just be some misunderstanding on my part. In any event, if
anyone can shed any light on this I'd appreciate it.

As long as I'm here, a 2nd question. Using the command line interface,
is there any way I can spawn more than one window to render different
plots in them at the same time? (Of, if Ticket #2380 is likely to be
worked on in the near future, that would be even better.)  Or, if
there is some other way to get multiple plots (from the command line)

Thanks!

-Mike

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