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Re: problem with plot

  • To: mathgroup at smc.vnet.net
  • Subject: [mg33356] Re: [mg33327] problem with plot
  • From: BobHanlon at aol.com
  • Date: Sun, 17 Mar 2002 05:33:07 -0500 (EST)
  • Sender: owner-wri-mathgroup at wolfram.com

In a message dated 3/16/02 2:17:03 AM, puma at puma.com writes:

>Please try this:
><<
>f[x_]:=0 /; x < 0 || x >= 1;
>f[x_]:=1 /; x >= 0 && x < 1/2;
>f[x_]:=-1 /; x >= 1/2 && x < 1;
>Plot[f[16 x],{x,0,1}];
>Plot[f[16 x],{x,-1,1}];
>
>Clear[f];
>>>
>why the curve disappear in the 2nd plot?
>only x-interval is changed!
>?????
>

f[x_]:=0/;x<0||x>=1;
f[x_]:=1/;x>=0&&x<1/2;
f[x_]:=-1/;x>=1/2&&x<1;

Plot[f[16 x],{x,0,1}];

You need more resolution in the PlotPoint sampling

Options[Plot, PlotPoints]

{PlotPoints -> 25}

Plot[f[16 x],{x,-1,1}, PlotPoints -> 30];


Bob Hanlon
Chantilly, VA  USA


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