MathGroup Archive 2004

[Date Index] [Thread Index] [Author Index]

Search the Archive

Basic conditional statement question.


Here is a question I would think has a simple solution.  Let's say I
have some variable "a" which is an integer, but I haven't defined it
in Mathematica.  I want to run a conditional statement on it. 
Basically

If[a!=0,Print["such and such"]]

When I do something like this, Mathematica I asume is spitting out a
null statement, because it doesn't do anything.  So, how can I define
"a" such that Mathematica knows it isn't =0 yet, still some integer.

The reason I ask is I am calculating Christophel symbols (and such)
and many of them =0, so I want to only output those that are not equal
to zero.

Thanks for any help,
Scott


  • Prev by Date: Re: Exporting 3D plots
  • Next by Date: ListContourPlot and missing data
  • Previous by thread: Re: transforming exponential of sums into product of exponentials
  • Next by thread: Re: Basic conditional statement question.