[GiNaC-list] Tutorial: Sub Class from symbol mysymbol.cpp

[jros]

As today everybody "googles" to find quick answer, I think this example
will be usefull to somebody like me, starting making clases with GiNaC.

This is a modified versions of Alexei's reply: "Re: Defining a new
symbol class (mysymbol.cpp)"

The new mysymbol class provides total time derivative.

The numbering corresponds to the steps of the mystring Tutorial at
Ginacs Tutorial.

It works with GiNaC 1.3.6 & 1.4

Enjoy, and thanks again

Javier




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