Re: How to plot discontinuous functions?

*To*: mathgroup at smc.vnet.net*Subject*: [mg90148] Re: How to plot discontinuous functions?*From*: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>*Date*: Tue, 1 Jul 2008 06:56:11 -0400 (EDT)*Organization*: Uni Leipzig*References*: <g4a6tv$8uh$1@smc.vnet.net>*Reply-to*: kuska at informatik.uni-leipzig.de

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