[GiNaC-list] casting

[Vladimir V. Kisil]

>>>>> On Tue, 7 May 2019 09:50:23 +0000 (UTC), Pedro Sosa via GiNaC-list <ginac-list at ginac.de> said:

    PS> Hello, I'm a begginer and I don't find how to convert from ex to
    PS> double in the tutorialSomebody can help me?  Thanks

    See "4.6.3 Converting numbers" in tutorial. Note that you may need
  to cast your ex to numeric first, e.g.:

  ex A = 2;
  double Ad = ex_to<numeric>(A).to_double();

  Sometimes evalf() may be needed as well:

  ex B = cos(Pi/5);
  double Bd = ex_to<numeric>(B.evalf()).to_double();

  Best wishes,
-- 
Vladimir V. Kisil                 http://www.maths.leeds.ac.uk/~kisilv/
  Book:     Geometry of Mobius Transformations     http://goo.gl/EaG2Vu
  Software: Geometry of cycles          http://moebinv.sourceforge.net/