Hi, While implementing a GiNaC based backend for my software I decided to replace doubles by GiNaC::exs. That seemed to work fine until I actually needed the final native value of the expression, so I changed my mind to use GiNaC::numerics instead, which works fine except for constants, since I'm unable to do things like GiNaC::numeric angle = 2 * GiNaC::Pi; is there a quick way to pass from a constant to a numeric? (or alternatively a way to turn expressions into doubles and I should go back to GiNaC::ex). Thanks in advance. David E. Narvaez