[GiNaC-list] comparing symbols

Jens Vollinga jensv at nikhef.nl
Fri Jul 25 16:23:13 CEST 2008


Chris Bouchard schrieb:
> x = lst @0x8a08c70, hash=0xc, flags=0x13, nops=2
>     0 (symbol) @0x8a3df40, serial=62607, hash=0x771ff4, flags=0x7, domain=0
>     1 (symbol) @0x8a2bde8, serial=62608, hash=0x771ff4, flags=0x7, domain=0

that is the problem: you use symbols with names "0" and "1" !

> Wouldn't that eliminate functional dependence on the
> variables represented by f1 & f2, making the return value
> a function of "0" and "1".  The end user could handle this
> by manually simplifying the output, but that wouldn't be
> optimal.

I don't know what you mean, but the "0","1",etc. are just names for the 
output and are _completely_ irrelevant for any algebraic operation.
If you want to match patterns then you have to use the C++ variable name 
of the symbols you give to r_sum.


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