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Re: declaring variables

  • To: mathgroup at
  • Subject: [mg4761] Re: declaring variables
  • From: vvs124 at (Victoria Steblina)
  • Date: Fri, 13 Sep 1996 13:54:47 -0400
  • Organization: Australian National University
  • Sender: owner-wri-mathgroup at

dh61 at (Burkhardt Goedde) wrote:

>Dear math users,
>just a simple problem, but I got no answer from thew book.
>Re[x + I y] gives
>Re[x + I y]
>Re[2 + 3 I]
>gives 2
>How could I tell Mathematica that x and y are real numbers?

There is a package <<Algebra`ReIm` that lets you specify that given 
variables are purely real. Try the following:

In[5]:= Needs["Algebra`ReIm`"]



        Re[x + I y]

        Im[x + I y]

Out[8]= x
Out[9]= y

The up definitions make the assignment associated with x and y rather
with Im...

Hope this helps


 Victoria Steblina                      Email: vvs124 at
 Optical Sciences Centre                Tel:   61 6 249 5129
 Australian National University         Fax:   61 6 249 5184


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