fwd: nDer, der1 on ti85
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fwd: nDer, der1 on ti85
Page 3-13 of the TI85 manual says: " nDer returns and *approximate*
numerical derivative of an expression with respect to the named variable."
On Page 3-14, it says, "The ti85 uses the rules of differentiation to
calculate the first and second derivatives *exactly* to 14 digits."
Therefore, I would guess that they use different algorithms. However, I get
0 using both methods on my 85.
Perhaps you have made a subtle typo? I made several when trying to repeat
your results.
Don Peate
My opinions do not necessarily reflect those of my employer.
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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