Comment #2 on issue 345 by crisjss: implement _sage_ methods
http://code.google.com/p/sympy/issues/detail?id=345
I would like to see sign function having _sage_ method.
Is just a matter of adding
def _sage_(self):
import sage.all as sage
return sage.sgn(self.args[0]._sage_())
to sign class.
Thanks,
Cristóvão Sousa
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