Yes, this implementation looks correct. Aaron Meurer
On Fri, Jul 29, 2016 at 7:04 AM, Felipe Vieira <[email protected]> wrote: > 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? > > -- > You received this message because you are subscribed to the Google Groups > "sympy" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To post to this group, send email to [email protected]. > Visit this group at https://groups.google.com/group/sympy. > To view this discussion on the web visit > https://groups.google.com/d/msgid/sympy/ac199e4a-62cf-4635-80fb-d45a5a828613%40googlegroups.com. > > For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups "sympy" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at https://groups.google.com/group/sympy. To view this discussion on the web visit https://groups.google.com/d/msgid/sympy/CAKgW%3D6%2Baak5zK60TK0WrxES-F6SBF%2BuCJQSqwjgAuTnt4HWeew%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
