On Sun, Mar 28, 2010 at 9:59 PM, Aaron S. Meurer <asmeu...@gmail.com> wrote: > The None is essentially inert substitution, so maybe it should work like > Integral(f(x), x)(y). I'd like to get the same syntax working for > f(x).diff(x)(y) to mean f'(y) (the derivative of f evaluated at y) as per > issue 1620. > > By the way, I implemented this to allow general case solutions from dsolve(), > for example (from the docstring of ode.ode_separable):
I see. I think a better way is to implement the proper substitution in derivatives (resp. evaluation of the derivative at a point), and the same for integrals, but I think you can just use integrate(f(y), (y, a, x)) to represent a primitive function, where "a" is a constant. Btw, maybe someone can correct me, but in my experience, it seems that definite integrals is all that is needed, all the primitive functions are just use in calculus classes, but otherwise it's imho better to use definite integrals. Ondrej -- You received this message because you are subscribed to the Google Groups "sympy" group. To post to this group, send email to sy...@googlegroups.com. To unsubscribe from this group, send email to sympy+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/sympy?hl=en.
