Re: [Q] Plotting non-continuous function

*To*: mathgroup at smc.vnet.net*Subject*: [mg4478] Re: [Q] Plotting non-continuous function*From*: rubin at msu.edu (Paul A. Rubin)*Date*: Mon, 29 Jul 1996 02:37:29 -0400*Organization*: Michigan State University*Sender*: owner-wri-mathgroup at wolfram.com

In article <4s4itn$9ud at dragonfly.wolfram.com>, pherron at GSB-Pound.Stanford.EDU (Michael C. Herron) wrote: -> ->Suppose I have defined: -> ->f[x_] := Which [x<=5,2,True,10] -> ->If I then do Plot [f[t],{t,0,20}], the resulting graphic has a ->vertical line at x=5. Is there anyway to avoid this? Ideally, I ->would like the plot to have an open ball on the line y=2 and a closed ->ball at y=10 to indicate that the function at x=5 has a limit from the ->right but not from the left. Is it possible to do this? If the ->answer is in a mathematica book, I would like a reference. -> ->Thanks. -> ->Michael You can always split the function into two separate functions: In[]:= f1[ x_ ] := 2 /; x <= 5 f2[ x_ ] := 10 /; x >= 5 In[]:= p = Plot[ {f1[x], f2[x]}, {x, 0, 10}, PlotRange -> {0, 12}, DisplayFunction -> Identity ]; Out[]= Plot::plnr: CompiledFunction[{x}, <<1>>, <<13>>-][x] is not a machine-size real number at x = 5.41667. <This highly ignorable error message gets repeated a few times.> In[]:= g = Graphics[ {Circle[ {5, 2}, .2 ], Disk[ {5, 10}, .2 ]} ]; In[]:= Show[ p, g, DisplayFunction -> $DisplayFunction, AspectRatio -> Automatic ]; Paul ************************************************************************** * Paul A. Rubin Phone: (517) 432-3509 * * Department of Management Fax: (517) 432-1111 * * Eli Broad Graduate School of Management Net: RUBIN at MSU.EDU * * Michigan State University * * East Lansing, MI 48824-1122 (USA) * ************************************************************************** Mathematicians are like Frenchmen: whenever you say something to them, they translate it into their own language, and at once it is something entirely different. J. W. v. GOETHE ==== [MESSAGE SEPARATOR] ====