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Mathematica 5 : strange Plot

• To: mathgroup at smc.vnet.net
• Subject: [mg43945] Mathematica 5 : strange Plot
• From: pacotomi at wanadoo.fr (pacotomi)
• Date: Wed, 15 Oct 2003 04:59:21 -0400 (EDT)
• Organization: Wanadoo, l'internet avec France Telecom
• Sender: owner-wri-mathgroup at wolfram.com

Hi,
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 ?

Pacotomi