Re: Mystifying Scoping of Piecewise Variable?
- To: mathgroup at smc.vnet.net
- Subject: [mg116135] Re: Mystifying Scoping of Piecewise Variable?
- From: CHARLES GILLINGHAM <cgillingham1 at me.com>
- Date: Thu, 3 Feb 2011 05:29:24 -0500 (EST)
You want:
myFunc = Function[{x}, Piecewise[{{x^2, x < 0}, {x, x >= 0}}]];
Begin forwarded message:
From: Frank Iannarilli <frankeye at cox.net>
Date: February 02, 2011 3:08:08 AM
To: mathgroup at smc.vnet.net
Subject: [mg116135] [mg116102] Mystifying Scoping of Piecewise Variable?
Perhaps I'm tired, but this is weird:
Clear[myFunc]
myFunc[y_] = Piecewise[{{x^2, x < 0}, {x, x >= 0}}]
(Same behavior below for either Set(=) or SetDelayed(:=) )
Plot[myFunc[y], {y, -10, 10}]
(returns empty plot)
Plot[myFunc[x], {x, -10, 10}]
(returns "expected" piecewise function plot)
What is the scoping of the Piecewise variable, in this case "x"?
How can one write a Module that creates and returns a Piecewise function? The scope of its argument is unclear to me.
Thanks