What I am using right now dear Riccardo is the following:
Suppose that my variable sigma(define as a symbol) depends of u, but at the same time this u is vectorial variable, which means for example in 3D the variable will be : u = [u_0, u_1, u_2], all the components of u are defined as symbols. Now I only need to do the following: In: sigma(*u) #so sigma depends of u_0, u_1, u_2, and if we use diff: In: print(sigma) Out: sigma(u_0,u_1,u_2) In: diff(sigma, u_1) Out: Derivative(sigma(u_0,u_1,u_2), u_1) -- 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 sympy+unsubscr...@googlegroups.com. To post to this group, send email to sympy@googlegroups.com. 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/66686d14-5f92-4378-b08a-5d304c177b44%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
