I think the issue is that you're not sympifying your arguments. Aaron Meurer
On Jun 23, 2012, at 9:27 AM, "[email protected]" <[email protected]> wrote: > Hi, I know that some dislike _diff_wrt, however admitting for the > moment that it is a good idea, can somebody help me with making this > work: > > In [1]: class Blah(Expr): > ...: _diff_wrt = True > > In [2]: c = Blah(1,2,3) > > In [3]: (2*c).diff(c) > AttributeError: 'int' object has no attribute 'is_number' > > Why does diff care about the int inside `c`? Why doesn't this work? > > -- > You received this message because you are subscribed to the Google Groups > "sympy" group. > To post to this group, send email to [email protected]. > To unsubscribe from this group, send email to > [email protected]. > For more options, visit this group at > http://groups.google.com/group/sympy?hl=en. > -- You received this message because you are subscribed to the Google Groups "sympy" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/sympy?hl=en.
