Re: nDer, der1 on ti85
[Prev][Next][Index][Thread]
Re: nDer, der1 on ti85
ok. what about on the ti82? how can i get an exact derivative on that since
it only has nDeriv()? there is no der1() or anything like that.
thanx.
--gc
At 06:03 PM 5/22/98 EDT, you wrote:
>I've got it now. nDer approximates the numerical derivative by calculating
>the slope of the secant line through the points (value - little delta,
>f(value - little delta)) and (value + little delta, f(value + little
>delta)). The smaller little delta is, the closer the approximation. I was
>able to reproduce your results by going into the tolerance menu (2nd CLEAR)
>and changing my little delta value to 0.001. If you change your little
>delta to something like 1e-5, you should get a closer approximation to what
>you want.
>
>Don Peate
>My opinions do not necessarily represent those of my employer.
>-------------
>Original Text
>From: "Garvin Cung" <garvinc@INAME.COM>, on 5/22/98 4:34 PM:
>To: smtp@netsrv1@servers[<CALC-TI@LISTS.PPP.TI.COM>]
>
>what the difference between 'nDer' and 'der1' on the ti85 calculator?
>
>and on this example why does it do this?
>
>nDer(x^4-4x^3+16x,x,2)
>i get the answer of 4e-6
>
>der1(x^4-4x^3+16x,x,2)
>i get the answer of 0
>
>the answer is supposed to be zero. why is the nDer one not exaclty 0, like
>der1, the way iy should be?
>
>--garvin
>_______________________________________________________
>Garvin Cung
>Email: garvinc@iname.com
>WWW: http://www.geocities.com/ResearchTriangle/lab/2240
>
_______________________________________________________
Garvin Cung
e-mail: garvinc@iname.com
URL: http://www.geocities.com/ResearchTriangle/lab/2240
References: