The problem is that Subs has wrong _hashable_content() I will send a pull request with a fix. However I am still interested to know how this was never before encountered. What was so special about this expression that it raised an error?
On 22 July 2012 01:02, [email protected] <[email protected]> wrote: >>>> (g(f(x))*Subs(Derivative(1, x), (x,), (1,))).diff(x) > TypeError: object of type 'Derivative' has no len() > > Simplifying the expression any further makes the error go away (for > instance removing the call to g). > > What perplexes me is how unremarkable the expression is. What can > cause the error? Any idea? -- 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.
