A89: Re: Inequalities

To: <assembly-89@lists.ticalc.org>
Subject: A89: Re: Inequalities
From: "Niklas Brunlid" <e96nbr@efd.lth.se>
Date: Fri, 6 Aug 1999 02:58:34 +0200
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> 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 =)



 / Niklas Brunlid
Check out Prosit for the TI-89 / TI-92 Plus at http://c625.sparta.lu.se
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           (Terry Pratchett, alt.fan.pratchett)

Follow-Ups:

A89: Re: Re: Inequalities

From: "Miles Raymond" <m_rayman@bigfoot.com>

References:

A89: Inequalities

From: JHill8075@aol.com