       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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