MathGroup Archive: December 2007 [00450]

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Is this a bug

To: mathgroup at smc.vnet.net
Subject: [mg84243] Is this a bug
From: "huxiaopengstat at gmail.com" <huxiaopengstat at gmail.com>
Date: Sat, 15 Dec 2007 15:36:54 -0500 (EST)

Clear[f]
f[x_] := x^2 + 1 /; x >= O
f[x_] := -x^2 - 1 /; x < O
Plot[f[x], {x, -2, 2}]

Above f is a piecewise function.But Plot can't plot the function. Why?
MY MATHEMATICA$B!!(Bis version 6.
can the piecewise function be defined like this?

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