[A89] Re: That 3d graph

To: assembly-89@lists.ticalc.org
Subject: [A89] Re: That 3d graph
From: jon p kotta <sqrt_-1@juno.com>
Date: Sat, 4 May 2002 16:46:54 -0500
Reply-To: assembly-89@lists.ticalc.org

I think it's this:

z(x,y) = sinc(sqrt(x^2 + y^2))

If you don't know what a sinc function is,

sinc(x) = sin(a*x)/(a*x), x != 0
sinc(0) = 1

I've seen both a = 1 and a = pi.  If this isn't the function in the
pictures, it sure looks a lot like it.

jk

On Fri, 3 May 2002 18:37:16 EDT MuntaKHib@cs.com writes:
> Does anyone in this mailing list know what equation gets that 3d 
> graph that 
> is associated with the TI-89? If you don't know what graph I'm 
> talking about, 
> go to www.ticalc.org's website, and in the top left hand corner, 
> there is a 
> picture of the calc with the 3d graph on it. Anytime the TI-89 is 
> shown in a 
> picture (online or not), it is shown with this graph on the screen. 
> Anyone 
> have an idea as to the equation?
> 
> 
> 
> 

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