Re: TI-92 - Will it do Implicit Differentiation?

To: CALC-TI@LISTS.PPP.TI.COM
Subject: Re: TI-92 - Will it do Implicit Differentiation?
From: GARY WARDALL <gwardall@LAKEFIELD.NET>
Date: Wed, 2 Sep 1998 00:36:19 -0500
Reply-To: GARY WARDALL <gwardall@LAKEFIELD.NET>

Yes it can. Here is a TI-92 function that will do 1st, 2nd., and 3rd
implicit derivative of the equation:  g(x,y)=0. That is the function
will yield y', y'', or y''' given that g(x;y)=0. Not g(x;y) must be
pre-defined.

If you want I could send an attachement later. The "‰" is the
derivative symbol. The "" is the sto symbol.

Good Luck
Gary Wardall

Here is the function:

(n)
Func
Local yp1,yp2
-‰(g(x,y),x)/(‰(g(x,y),y))

If n=1
Goto aa55
-‰(g(x,y),x)/(‰(g(x,y),y))yp1
propFrac(‰(yp1,x)+‰(yp1,y)*yp1)
If n=2
Goto aa55

-‰(g(x,y),x)/(‰(g(x,y),y))yp1
propFrac(‰(yp1,x)+‰(yp1,y)*yp1)yp2
propFrac(‰(yp2,x)+‰(yp2,y)*yp2)
If n=3
Goto aa55
"Input Error"
Lbl aa55

EndFunc




*******************************
>Will the TI-92 do implicit differentiation, and if so, where can I find
>information on how to? I have read the manual that came with the 92 and
>it says nothing about the subject.
>Thanks,
>John Carnahan
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