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MathGroup Archive 1995

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Is there a way of declaring a variable REAL?

  • To: mathgroup at christensen.cybernetics.net
  • Subject: [mg2007] Is there a way of declaring a variable REAL?
  • From: wexler at u.washington.edu (Carlos Wexler)
  • Date: Thu, 14 Sep 1995 23:27:25 -0400
  • Organization: University of Washington, Seattle

It seems that the basic variable type in Mathematica is COMPLEX which is 
fine most of the time, but sometimes one needs a variable that is defined 
to be real, i.e. such that "Re[x + I y]" produces "x". Is there any way 
to do this, something like "declare x,y as real"? Ideally it should 
report an error if one tried to assign a COMPLEX value to it, but I don't 
need that much right now, just the basic declaration such that 
simplifications are carried as the example above...

Any hint would be appreciated!

Carlos



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