On Thu, Dec 4, 2008 at 2:13 PM, Jason Grout <[EMAIL PROTECTED]> wrote:
>
> 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
>
This is probably off topic, but you can always get any Sage global
variable you're used to by doing sage.all.varname. For example:
sage: I = 5
sage: I
5
sage: sage.all.I
I
-- William
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