Le forum de XCAS

Publié : **dim. mai 06, 2018 10:06 am**

Hi,

How do you evaluate a symbolic expression in C++? If I do this

giac::gen dbg("1+1",&ct);
dbg = giac::eval(dbg, &ct);
cout << gen2string(dbg) << endl;

I correctly get "2"

But if I do this:

Code : Tout sélectionner

giac::gen dbg("x+2*x",&ct);
dbg = giac::eval(dbg, &ct);
cout << gen2string(dbg) << endl;

I still get "x+2*x".

Jose

Publié : **dim. mai 06, 2018 2:44 pm**

That's normal, evaluation does (almost) no auto-simplification, it replaces identifiers by their values. Run _simplifier(eval(...)) to get the same as regroup in Xcas (default auto-simplification).

Le forum de XCAS

evaluating algebraic expression in c++

evaluating algebraic expression in c++

Re: