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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
> 
>