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
>