[TI-M] Re: Derivative on 83+

To: ti-math@lists.ticalc.org
Subject: [TI-M] Re: Derivative on 83+
From: robvanwijk@gmx.net
Date: Mon, 9 Sep 2002 16:59:12 +0200 (MEST)
References: <275601c25542$bad048d0$2801010a@mail2world.com>
Reply-To: ti-math@lists.ticalc.org


> >
> >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
> 

If you use order+1 points (eg 3 for a quad, 4 for a cubic), the result will
be exact (except the last digit, sometimes).

Rob van Wijk

-- 
GMX - Die Kommunikationsplattform im Internet.
http://www.gmx.net

References:

[TI-M] Re: Derivative on 83+

From: "raykornele" <raykornele@iVillage.com>