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MathGroup Archive 2004

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Re: Piecewise functions

  • To: mathgroup at smc.vnet.net
  • Subject: [mg51565] Re: Piecewise functions
  • From: koopman at sfu.ca (Ray Koopman)
  • Date: Sat, 23 Oct 2004 00:21:46 -0400 (EDT)
  • References: <cl9tau$7oi$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Luca <luca at nospam.it> wrote in message news:<cl9tau$7oi$1 at smc.vnet.net>...
> 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.

y[x_] := Which[ 3 <= x   ,  x,
               -1 < x < 3, -x,
                True     ,  1]


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