On Aug 25, 2008, at 8:28 PM, William Stein wrote: > On Mon, Aug 25, 2008 at 8:25 PM, Robert Bradshaw > <[EMAIL PROTECTED]> wrote: >> >> On Aug 25, 2008, at 8:05 PM, Robert Dodier wrote: >> >>> Tim Lahey wrote: >>> >>>> I presume that Sage can't take a derivative with respect to a >>>> function >>>> (Maple can't which is why this code is written this way). >>> >>> By the way, what do you mean by that? What is the operation that >>> you would like to do, but fails? Thanks for the info. >> >> You could use automatic differentiation, but that has yet to be >> implemented in Sage. http://en.wikipedia.org/wiki/ >> Automatic_differentiation > > Umh, was that just a really fancy way to say "use the chain rule"?
That's the underlying principle, but you don't have to represent the function as a symbolic function, you just call it and track what happens. - Robert --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to sage-devel@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-devel URLs: http://www.sagemath.org -~----------~----~----~----~------~----~------~--~---
