This could solve the issue https://github.com/sympy/sympy/issues/11444
*Expr.is_constant()* checks whether the expression derivative by its free symbols is nonzero. Unfortunately *A[i].diff(i)* currently gives 0. Free symbols of *A[i]* are *A *and *i*. On Thursday, 26 January 2017 17:04:01 UTC+1, Björn Dahlgren wrote: > > > Do you have an applied example where this would help? If it simplifies > users' code I think that would be an argument for it. > Not really, indices are supposed to be integers, the derivative doesn't make any sense. On the other hand integer symbols are still derivable in SymPy. Furthermore, nothing forbids to use indexed objects as very strange functions. -- 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/b3729b12-0fbd-4fa2-ab6a-c944fef19f11%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
