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Re: Real numerical computations

• To: mathgroup at smc.vnet.net
• Subject: [mg71767] Re: Real numerical computations
• From: Bill Rowe <readnewsciv at sbcglobal.net>
• Date: Tue, 28 Nov 2006 06:04:21 -0500 (EST)

On 11/27/06 at 4:04 AM, jcsantos at fc.up.pt (José Carlos Santos) 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)?

Take a look at the package Miscellaneous`RealOnly`

i.e.

In[1]:=
<<Miscellaneous`RealOnly`

In[2]:=
(-1)^(1/3)//N

Out[2]=
-1.
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