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Math Forum » Discussions » Software » comp.soft-sys.math.mathematica

Topic: declaring variables
Replies: 3   Last Post: Sep 16, 1996 10:33 PM

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Victoria Steblina

Posts: 18
Registered: 12/7/04
Re: declaring variables
Posted: Sep 13, 1996 1:00 PM
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dh61@rs3.hrz.th-darmstadt.de (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@rsphy1.anu.edu.au
Optical Sciences Centre Tel: 61 6 249 5129
Australian National University Fax: 61 6 249 5184

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