       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)

```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][], {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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