Re: [GiNaC-devel] evalf() on cube roots

Hi, On 08/01/2015 08:01 PM, Jan Rheinländer wrote:

I noticed that

evalf( (-1)^(1/3) )

gives

0.5+0.86602540378443864673*I

Is there any way to tell GiNaC to return the real root by default?

There isn't. GiNaC, like almost all other systems, returns the solution on the principal branch, compatible with exp(log(-1)/3). -richy. -- Richard B. Kreckel <http://in.terlu.de/~kreckel/>