[TI-M] Re: Derivative on 83+
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[TI-M] Re: Derivative on 83+
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<-----Original Message----->
>
>From: robvanwijk@gmx.net
>Sent: 9/5/2002 3:54:59 PM
>To: ti-math@lists.ticalc.org
>Subject: [TI-M] Re: Derivative on 83+
>
>
>
> For a polynomial, put the function in a Y1. Go to lists and set up
> enough
> points to do a regression one less order than the function (e.g., if
> your poly
> is a cubic, you need three points). Set up L1 as, say, 0, 1, 2.
> set up L2 as derivatives of Y1 at 0, 1, 2.
>
> Now, do a quadratic regression, Go to Y2 and install the equation
(var,
> (5)stats,
> Eq, (7)equation. This is the derivative curve in symbolic.
>
>
> KrazyKyngeKorny
>
>
>If you use "QuadReg(L1,L2,Y2)" the equation is automatically
>stores to Y2. Saves you the recalling of RegEq.
>
>Rob van Wijk
>
=====
Thanks, Rob. I can use that information. Actually, there may be a slight
regression error
because the regression formula is an approximation. For a quad, it's
pretty close.
Also, since the calc can do quarticReg you can find derivative of a
fifth order poly thusly.
KrazyKyngeKorny
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