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MathGroup Archive 2003

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RE: Mathematica 5 : strange Plot

  • To: mathgroup at smc.vnet.net
  • Subject: [mg43983] RE: [mg43945] Mathematica 5 : strange Plot
  • From: David.Annetts at csiro.au
  • Date: Thu, 16 Oct 2003 04:16:27 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

Hi Pacotomi,

> Plot[ ] gives me a perplexing graphic :
> 
> let :
> 
> f[x_] := If [x < 20, 0, x - 20]
> 
> Then, I try :
> 
> Plot[f[x], {x, 0, 100}]
> 
> curiously, I get a plot with x between 0 and 40 and f(x) between 0 and
> 80. The x range is false but the y one is right.
> 
> What's wrong with this simple notebook ?

Nothing per se.  By default (eg section 1.9.1 of online help), Plot tries
isolate the most interesting part of the graph.  Most recently, this was
discussed in [mg43637] -- 2 weeks ago.  

To see everything, you need to use 
	Plot[f[x], {x, 0, 100}, PlotRange->All];

This can be further customised using
	Plot[f[x], {x, 0, 100}, PlotRange->{{-20, 120}, All}]; or
	Plot[f[x], {x, 0, 100}, PlotRange->{All, {-20, 100}];

Regards,

Dave.
==========================================
  Dr. David Annetts
  EM Modelling Analyst
  CSIRO DEM            Tel: +612 9490 5416
  North Ryde           Fax: +612 9490 5467
  Australia         David.Annetts at csiro.au
===========================================


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