[GiNaC-list] Undefine the predefined numeric consant 'I'?

Warren Weckesser warren.weckesser at gmail.com
Fri Nov 1 23:19:44 CET 2019

Is there an easy way to undefine the predefined numeric value 'I'?  If
I define a symbol 'I', use it in an expression, and then output that
expression to cout after modifying stream with csrc, 'I' is converted
to 'std::complex<double>(0.0,-1.0)'.  I'd like the output to be just


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