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MathGroup Archive 1995

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Plotting Piecewise Functions with Discontinuites

  • To: mathgroup at christensen.cybernetics.net
  • Subject: [mg1941] Plotting Piecewise Functions with Discontinuites
  • From: "Paul J. Simonich" <simonichpj%dfms%usafa at dfmail.usafa.af.mil>
  • Date: Wed, 23 Aug 1995 22:33:28 -0400
  • Organization: U. S. Air Force Academy

I'm trying to plot a piecewise function with a discontinuity at x=3:

f[x_]:=Which[x<=-3,3,
	     x>=-3 && x<=3, Abs[x],
	     x>3,-3]
Plot[f[x],{x,-7,7},AxesLabel->{x,y},PlotRange->All];

Mathematica draws a veritcal line connecting the points of discontinuity.
Is there a "simple way" to get Mathematica to not evaluate the function 
exactly at the point of discontinuity besides using Show[ ] with two 
separate plots?

Thanks in Advance.
Capt Paul Simonich
Dept of Mathematical Sciences
US Air Force Academy





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