Tim Lahey wrote:
>
> On Dec 2, 2008, at 10:14 PM, Jason Grout wrote:
>
>>
>> Tim Lahey wrote:
>>> Hi,
>>>
>>> The discussion of imaginary numbers reminded me of a
>>> question I've had for some time. Is there a way to set
>>> what's used for the imaginary unit? I often set it to
>>> _j in Maple and I was wondering if there was any way to
>>> do it in Sage.
>>
>>
>> Do you mean the variable that you use, or just how it is printed?
>>
>> If it's the variable that you use, then you can just set it using normal
>> assignment:
>>
>> sage: i = CC(I)
>>
>> Now i is the CC i instead of the symbolic i.
>
> Well, both actually. I'd prefer to use _j instead and have it
> printed as that, because I'd like to use i (and I) for something
> else.
I imagine that you could just change the _repr_ function in the symbolic
constant:
sage: I._repr_??
Type: instancemethod
Base Class: <type 'instancemethod'>
String Form: <bound method I_class._repr_ of I>
Namespace: Interactive
File:
/home/grout/sage/local/lib/python2.5/site-packages/sage/functions/constants.py
Definition: I._repr_(self, simplify=True)
Source:
def _repr_(self, simplify=True):
"""
EXAMPLES:
sage: repr(I)
'I'
"""
return "I"
Change that function to return "_j" if you want.
sage: def complex_repr(simplify=True):
....: return "_j"
....:
sage: I._repr_ = complex_repr
sage: I
_j
sage: i^3
-1*_j
Jason
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