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answered 2012-04-15 06:14:54 -0500

DSM gravatar image

f({x:2+2i}) can never have worked: 2i isn't valid Sage. Either use *I or j, depending on where you want the result to live:

sage: 2+2i   
------------------------------------------------------------
   File "<ipython console>", line 1
     Integer(2)+2i
                 ^
SyntaxError: invalid syntax

sage: 2+2j
2.00000000000000 + 2.00000000000000*I
sage: parent(_)
Complex Field with 53 bits of precision
sage: 2+2*I    
2*I + 2
sage: parent(_)
Symbolic Ring