Comment #17 on issue 1932 by [email protected]: Relationals do not work
with any methods of Expr
http://code.google.com/p/sympy/issues/detail?id=1932
I modified the do() definition to handle passed functions and did a little
cleanup:
def do(self, e):
if isinstance(e, (FunctionClass, Lambda, type(lambda:1))):
return self.applyfunc(e)
e = S(e)
i = e.free_symbols - self.free_symbols
if len(i) != 1:
raise ValueError('expecting a variable to represent a side')
i = i.pop()
return self.applyfunc(lambda side: e.subs(i, side))
e=Eq(2*x+4, 5)
e.do(sin)
sin(2*x + 4) == sin(5)
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