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complex-valued expression not simplifying completely (was: ARghh!!)

• To: mathgroup at smc.vnet.net
• Subject: [mg18790] complex-valued expression not simplifying completely (was: ARghh!!)
• From: paulh at wolfram.com (P.J. Hinton)
• Date: Thu, 22 Jul 1999 08:19:16 -0400
• Organization: Wolfram Research, Inc.
• References: <7n12tn$bd7@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

In article <7n12tn$bd7 at smc.vnet.net>, "O. Matt Umurhan" <matt at kelvin.nas.nasa.gov> writes:

> 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.

Given that the Mathematica kernel in its default state evaluates
your first output to a simpler form:

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

Out[1]= -42 + 6 I

it is not clear what might be causing your troubles.  Perhaps you
could post a minimal example of an input that gives rise to the
undesired result?

--
P.J. Hinton	
Mathematica Programming Group		paulh at wolfram.com
Wolfram Research, Inc.
Disclaimer: Opinions expressed herein are those of the author alone.