"JV" == Jens Vollinga <vollinga@physik.uni-wuppertal.de> writes: JV> Necessary or not? That's the key issue. If you like to add all JV> these functions then we are back at my initial objections.
My personal opinion is that GiNaC should provide basic functionality for drawing AND an easy possibility for a user to extend/redefine the default routines. JV> Is there something else involved than using the numerical value JV> of an expression at certain evaluation points? Yes, Daniel already mentioned that. Eg, since Asymptote uses cubic splines a much better output can be obtained with an enriching evalf() at a mesh points with diff().evalf(). A user should have a freedom to get access to the whole expression and whole GiNaC set of tools to create his own output routines adjusted to specific cases. Best wishes, Vladimir -- Vladimir V. Kisil email: kisilv@maths.leeds.ac.uk -- www: http://maths.leeds.ac.uk/~kisilv/