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