Discussion:  All Tools on TI Calculator 
Topic:  Picewise functions on TI interactive 
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Subject:  RE: Picewise functions on TI interactive 
Author:  EuripidesPants 
Date:  Nov 8 2006 
> I used to know how to do this, but now it's driving me crazy again.
> Can anyone explain what the third parameter does? Both example have
> 0 as the third parameter. I've seen other things used for the third
> parameter, but it is not explained! Help!
Define this function
> as:
g(x) := when(x<pi, 4*sin(x), 0) + when(x>=pi and x<0, 2x+6,
> 0) + when(x>=0, 6.1x^2, 0) + when(x>6, undef, 0)
Susan, it appears the third parameter is an 'else' condition. See
http://www.scholennetwerk.be/ig/TII/PDF/10%20Programming.pdf for some indication
of this.
So
g(x):= when(x<0, x, 0) + when(x>=0, x, 0)
is the same as
g(x):= when(x<0, x, x)
and it is a graph of the absolute value function.
The third parameter doesn't come into play if you explicitly define the function
for each condition on x.
Hope this helped!
Carl
 
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