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Re: How to plot discontinuous functions?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg90150] Re: [mg90135] How to plot discontinuous functions?
  • From: Bob Hanlon <hanlonr at cox.net>
  • Date: Tue, 1 Jul 2008 06:56:34 -0400 (EDT)
  • Reply-to: hanlonr at cox.net

f[x_] := If[x < 1, 1, 2];
Plot[f[x], {x, 0, 2},
 PlotRange -> {0, 3}, Exclusions -> 1]


Bob Hanlon

---- Aaron Fude <aaronfude at gmail.com> wrote: 
> Hi,
> 
> If a function is defined via If, then when plotted it does not
> acknowledge the discontinuity. E.g.
> 
> f[x_] := If[x < 1, 1, 2];
> Plot[f[x], {x, 0, 2}, PlotRange -> {0, 3}]
> 
> Defined via Piecewise, it does, but in my experience, not always:
> f[x_] := Piecewise[{{{1, 1}, x < 1}}, {2, 2}];
> Plot[f[x][[1]], {x, 0, 2}, PlotRange -> {0, 3}]
> 
> How do I make the Plot function try to acknowledge the discontuity by
> not connecting the left limit and the right limit?
> 
> Thanks,
> 
> Aaron
> 



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