Re: Real numerical computations
- To: mathgroup at smc.vnet.net
- Subject: [mg71785] Re: Real numerical computations
- From: José Carlos Santos <jcsantos at fc.up.pt>
- Date: Wed, 29 Nov 2006 02:56:26 -0500 (EST)
- References: <ekeb6t$t42$1@smc.vnet.net> <ekh5n2$rp1$1@smc.vnet.net>
On 28-11-2006 11:14, Jean-Marc Gulliet wrote: >> With Mathematica, if I type >> >> N[(-1.)^(1/3)] >> >> I get >> >> 0.5 + 0.866025 i >> >> This is correct, of course, but I would like to get -1. instead. How do >> I tell Mathematica that I want a real result (if there is one)? >> > Have a look at the technical FAQ titled "How do I get x^(1/3) (where x > is a negative number) to evaluate to a real number?" > > http://support.wolfram.com/mathematica/mathematics/algebra/realpower.html Thanks. I didn't even knew about this FAQ! Best regards, Jose Carlos Santos