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]