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Piecewise functions

• To: mathgroup at smc.vnet.net
• Subject: [mg51553] Piecewise functions
• From: Luca <luca at nospam.it>
• Date: Thu, 21 Oct 2004 22:22:10 -0400 (EDT)
• Sender: owner-wri-mathgroup at wolfram.com

Hi all. I'm studying for the exam of signals and systems and I was
trying to plot some kind of functions I transformed for exercise. So, I
need to plot piecewise functions like:

y(x) = x if x > 3
y(x) = -x if -1 < x < 3
y(x) = 1 else

(should have been a system).
I found out in the guide the chapter about this, and I learned that it
is possible with the function UnitStep, which I know. Anyway, I found
it difficult to determine the equation of the function using this
method. Is it possible to do it simply writing everything like I did
before, more or less? i.e. without having to determine the equation
with the UnitStep function.
Hope I've been clear enought. Many thanks.

Luca

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