       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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