Take a read of http://docs.sympy.org/latest/tutorial/gotchas.html#symbols
(and I recommend the rest of that tutorial as well). You need to
define t first. Probably you just want to add
t = symbols('t')
somewhere to your script.
Aaron Meurer
On Fri, Nov 8, 2013 at 6:48 PM, Erin Hodgess <[email protected]> wrote:
> Hello!
>
> I would like to use a letter as a constant in integration/differentiation
> problems but I am having some trouble.
>
> For instance, I would like to have
> exp(t*x)
>
> But when I do that, I get "t is not defined".
>
> This is in Python 2.7.5
>
> Thanks for any help!
>
> Sincerely,
> Erin
>
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