python - Evaluation of sympy.function containing a NumPy function -

my problem following code doesn't evaluate function f

class f(sympy.function):     @staticmethod     def _imp_(x):         return numpy.sin(x)  # shows f(0.1)          # return sympy.sin(x)  # shows 0.0998334166468282  print f(0.1) 

numerically when use inside _imp_ function numpy procedures. works when use sympy only. wrong @ here?

there nothing wrong.

the precision due floating point numbers.

check here , here ,where can set precision.