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MathGroup Archive 2005

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Plotting numerical derivatives

  • To: mathgroup at smc.vnet.net
  • Subject: [mg53883] Plotting numerical derivatives
  • From: "plizak" <plizak at gmail.com>
  • Date: Tue, 1 Feb 2005 04:08:48 -0500 (EST)
  • Sender: owner-wri-mathgroup at wolfram.com

I'm trying to differentiate a function of the form

FTD[t1_, t2_] := a function of t1 and t2

I can get the derivative fine by using:
ND[ND[Fun[t1, t2 ], {t1, 1}, 200000], {t2, 1}, 200000 ]

However, I'd like to plot it in a 3D plot, and it just doesn't want to
work.  I get a flat plot with value 0.  The code I tried to use is:

Plot3D[ND[ND[Fun[t1, t2 ]  , {t1, 1}, a]  , {t2, 1}, b ], {a, 1,
500000}, {b, 1, 500000}]

Any tips on getting this to plot would be greatly appreciated!

I don't want to have to code up a way to build a big table and
calculate all the cells individually, as I will have to do this for
many other functions.

If I do have to build a table, is there a quick way to do that in
Mathematica?  or wouldusing Table[...] be best?



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