Let me try again:
class Double(Function):
u"""A simple function that doubles the input."""
nargs = 1
@classmethod
def eval(cls, arg):
pass
if arg.is_Number:
return sympy.Mul(2, arg)
def fdiff(self, argindex = 1):
return sympy.Integer(2)
This generates:
In [47]: Double(x)
Out[47]: Double(x)
In [48]: Double(2*x)
Out[48]: Double(2*x)
In [49]: Double(2*x).fdiff()
Out[49]: 2
In [50]: Double(2*x).diff()
Out[50]: 4
So now it looks like it is working as expected.
I thought the same way I could do: f = Function('f') I could also do d =
Double('d') then d(2).
As mentioned above, is this the expected way of doing things?
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