Tim Lahey wrote:
>
> The only problem I see with this is that it doesn't free up the
> original. One
> reason for changing the symbolic I, is to be able to use it for other
> variables.
Sure it does:
sage: _j = I
sage: _j.rename("_j")
sage: var("I")
I
sage: type(I)
<class 'sage.calculus.calculus.SymbolicVariable'>
sage: I^2
I^2
sage: type(_j)
<class 'sage.functions.constants.I_class'>
sage: _j^2
-1
In fact, you could go one further. "I" is just defined by:
I = sage.functions.I_class()
(in sage/functions/constants.py). So you could just do:
sage: _j = sage.functions.constants.I_class()
and not even touch the global I variable. Then assign I to be whatever
you want, whenever you want.
Jason
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