[GiNaC-devel] Implicit derivation of functions (re-submission)

[Vladimir V. Kisil]

	Dear Richard,
	
>>>>> On Wed, 31 Dec 2014 19:41:11 +0100, "Richard B. Kreckel" <kreckel at in.terlu.de> said:

    RK> Your proposal is to have two ways to implement a function's
    RK> derivative: 1) by registering the existing derivative_func (pure
    RK> formal derivative) 2) or your new impl_derivative_func (smart
    RK> derivative, has to care about chain rule)

    RK> I wonder if there is a way to make this more uniform. What do
    RK> you think?

    Of course, the chain rule may be included as a particular case in
  the more general method. This will require a user slightly revise
  their custom function definitions for the new version of GiNaC. Do you
  consider this to be a reasonable price for a more straightforward code? 

    RK> derivatives, your patch has three (very minor) problems which
    RK> should be fixed before committing:

    You are right. I may do this within a couple of weeks, I hope.

    Best wishes,
    Vladimir
-- 
Vladimir V. Kisil     email: kisilv at maths.leeds.ac.uk
                        www: http://www.maths.leeds.ac.uk/~kisilv/
Book: Geometry of Mobius Transformations
http://www.worldscientific.com/worldscibooks/10.1142/p835