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Re: Abs and variables

• To: mathgroup at smc.vnet.net
• Subject: [mg4278] Re: Abs and variables
• From: vvs124 at rsphy1.anu.edu.au (Victoria.Steblina) (Victoria Steblina)
• Date: Sat, 29 Jun 1996 03:53:15 -0400
• Organization: Optical Sciences Centre, ANU
• Sender: owner-wri-mathgroup at wolfram.com

>        How can I have the Abs function treat real variables properly?
>I seem to recall a way of declaring a variable real, but I don't
>remember how.  If there is such a way, would this work with Abs; i.e.
>fix the variable a so that "Abs[a]" will give a result of "a"?


How about this?

In[114]:=  Needs["Algebra`ReIm`"]

In[115]:= Im[a]^=0;

In[116]:= Re[a + I]
Out[116]= a


Vicki

________________________________________________________________________

 Victoria Steblina                      Email: vvs124 at rsphy1.anu.edu.au
 Optical Sciences Centre                Tel:   61 6 249 5129
 Australian National University         Fax:   61 6 249 5184

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