# Revision history [back]

It depends on what do you consider as a "mapping". The symbolic expression defined by

sage: var('t')
t
sage: x = vector([1,1])*exp(-t)


represents a (symbolic) function, which you can evaluate:

sage: x(t=13)
(e^(-13), e^(-13))


or derivate:

sage: x.derivative(t)
(-e^(-t), -e^(-t))


and so on.

If you want to define a python function, then you have to write something like:

sage: x = lambda t: (e^(-t), e^(-t))
sage: x(13)
(e^(-13), e^(-13))