[sage-support] Re: Setting symbol for imaginary unit?

[Tim Lahey]

Hi,

Thanks. I was kind of hoping for something less drastic,
but that works. In Maple there is just a variable you can
set which controls things, so you can do it on a per script
basis.

Thanks.

Tim.

---
Tim Lahey
PhD Candidate, Systems Design Engineering
University of Waterloo
http://www.linkedin.com/in/timlahey

On Dec 2, 2008, at 11:12 PM, Jason Grout wrote:

constant:

sage: I._repr_??
Type:           instancemethod
Base Class:     <type 'instancemethod'>
String Form:    <bound method I_class._repr_ of I>
Namespace:      Interactive
File:   

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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I imagine that you could just change the _repr_ function in the symbolic /home/grout/sage/local/lib/python2.5/site-packages/sage/functions/ constants.py

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