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Re: ARghh!!

• To: mathgroup at smc.vnet.net
• Subject: [mg18838] Re: [mg18772] ARghh!!
• From: "Tomas Garza" <tgarza at mail.internet.com.mx>
• Date: Thu, 22 Jul 1999 08:19:46 -0400
• Sender: owner-wri-mathgroup at wolfram.com

O. Matt Umurhan [matt at NOSPAM.kelvin.nas.nasa.gov] wrote:

> I am having the worst time dealing with a complex numbered expression.
> The problem is this:  I have a numerical expression I wish mathematica
> to evaluate, the expression happens to be complex.  So, I have it
> do the evaluation and for output it gives me, for example,
>
> Out[122]=       ((1+ 2 I) - (43 - 4 I))
>
> when the ouput ought to read:
>
> Out[123]=      -42 - 2 I
>
> it leaves the output with these damned parenthesis in there and
> I do not know, for the life of me, how get take this output and
> remove these strange and pesky parens.

What makes you think the output should read -42 - 2I when it is -42 + 6I?
Anyway, I don't see why the result doesn't get simplified automatically.
Have you tried Simplify, FullSimplify, etc.? Here's what I get (both in
Version 3 and Version 4):

In[1]:=
((1 + 2  I) - (43 - 4  I))

Out[1]=
-42 + 6 I

Perhaps you could give us the previous input line (In[121]) to see what's
going on.

Tomas Garza
Mexico City