Re: Complex numbers in Mathematica
- To: mathgroup at smc.vnet.net
- Subject: [mg61687] Re: [mg61647] Complex numbers in Mathematica
- From: Bob Hanlon <hanlonr at cox.net>
- Date: Wed, 26 Oct 2005 01:01:40 -0400 (EDT)
- Reply-to: hanlonr at cox.net
- Sender: owner-wri-mathgroup at wolfram.com
Factor[(5-3I)+(-4+I)x+(1-I)x^2] ((1 + I) - I*x)*((1 + I)*x + (1 - 4*I)) Sqrt[-1] I However, after loading the standard add-on package Miscellaneous`RealOnly` Needs["Miscellaneous`RealOnly`"]; Factor[(5-3I)+(-4+I)x+(1-I)x^2] Nonreal::warning: Nonreal number encountered. Nonreal Sqrt[-1] Nonreal::warning: Nonreal number encountered. Nonreal Quit the kernel and start over. Bob Hanlon > > From: per at RQNNE.invalid (Per Rønne) To: mathgroup at smc.vnet.net > Date: 2005/10/24 Mon PM 09:07:04 EDT > Subject: [mg61687] [mg61647] Complex numbers in Mathematica > > If I write: > > In[8]=Factor[(5 - 3I) + (-4 + I)x + (1 - I)x^2] > > I get > Nonreal::"warning": "Nonreal number encountered." > Out[8]= Nonreal > > The same with Sqrt[-1]. > > Why doesn't it show the complex numbers? According to the books it > should - is it a matter of preferences set? > > I'm using Mathematica Teacher's Edition 1.1 on MacOS X. > -- > Per Erik Rønne > >