I'm teaching ODEs right now and I'd like to plot the usual sort of solution to a 2-by-2 linear DE system, but the following doesn't work:
sage: evec = vector([1,2])
sage: var('t')
sage: parametric_plot( exp(-t) * evec, 0, 2)
The traceback's complaint is "<type 'exceptions.TypeError'>: function
takes at most 1 positional arguments (2 given)".
I know I could manually do (exp(-t), 2*exp(-t)), but the above form
seems so natural. Is there a way to get that to work?
Dan
--
--- Dan Drake <[EMAIL PROTECTED]>
----- KAIST Department of Mathematical Sciences
------- http://math.kaist.ac.kr/~drake
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