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 >