Re: Hybrid functions on the ti-85.


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Re: Hybrid functions on the ti-85.



Unfortnately, the recent suggestion to multiply a function by (5<x<10)
to restrict it's range doesn't work. It's very intuative to do it like
that, but the ti85, real computers, and probably the other ti calcs all
evaluate that range expression like this:


(5<x) < 10


since  (5<x) is always less than 10 (it's either 1 or 0; true or false),
your suggestion really just graphs the whole function. And if you try
the range
(-8<x<-3), you won't see anything.


Just like with the conversion controversy a few weeks ago, you have to
be really careful and type your expressions into the calculator with
enough parethesis and the exact formatting it expects, etc, or else the
calculator will not do what you want it to.


Anyway, you need to enter


y=(x^2 -4) (x>5) (x<10)


if you want to see the function  y=x^2-4  on the range  5<x<10 . Please
refer to my last posting for an explanation.


-Jonathan


References: