Re: A89: Re: Inequalities

To: assembly-89@lists.ticalc.org
Subject: Re: A89: Re: Inequalities
From: JHill8075@aol.com
Date: Thu, 5 Aug 1999 22:23:59 EDT
Delivered-To: assembly-89-outgoing@towerguard.unix.edu.sollentuna.se
Delivered-To: assembly-89@lists.ticalc.org
Reply-To: assembly-89@lists.ticalc.org

But how do you graph that equation in Function mode? When I try it, it graphs 
nothing.

In a message dated 8/5/99 8:57:18 PM Eastern Daylight Time, e96nbr@efd.lth.se 
writes:

<< > I know that this doesn't have much to do with assembly programming, but 
TI
 > won't answer the question clearly, so I'm going to see if anyone here can
 > figure it out. Is there a way to graph inequalities like 4X^2 + Y >= 15 (>=
 > is greater than or equal to)?? If not, could an assembly program be written
 > to do this? Thanks.

 You need to create a function that returns 1 of it's input i "true" and 0 if 
it
 is "false".
 func test(x)
 :if x then
 : return 1
 :else
 : return 0
 :endif

 Then you can graph your function with
 z1(x,y) = test((4x^2+y)>=15)

 test() can also be used for piecewise graphing.

 This is one of the things I dislike about my TI-92... whil it is 
mathematically
 correct, it was so much easier on the 8x series (except the 89) where a test
 actually returns 1 for true and 0 for false:
 y1(x) = (x^2)(x<1)+(x^3)(x>=1)

 *Much* nicer =) >>

Follow-Ups:

Re: A89: Re: Inequalities

From: "Niklas Brunlid" <e96nbr@efd.lth.se>