Derivatives D[ ] as Functions inside Tables; Need Help!
- To: mathgroup at smc.vnet.net
- Subject: [mg13102] Derivatives D[ ] as Functions inside Tables; Need Help!
- From: siegman at ee.stanford.edu (AES)
- Date: Tue, 7 Jul 1998 03:44:07 -0400
- Organization: Stanford University
- Sender: owner-wri-mathgroup at wolfram.com
I'm trying to define a function f1[a,x] and its derivative f2[a,x],
where from my point of view x is the independent variable and "a" is
a parameter I'll change on different runs. So I write, as a simple
example:
Remove["Global`*"]
f1[a_,x_] :=a Cos[x] + a^2 Sin[x]
f1[a,x]
f2[a_,x_] := D[f1[a,x],x]
f2[a,x]
a=2
f1[a,x]
f2[a,x]
Table[{x, f1[a,x], f2[a.x]} // N, {x,0,4}] // TableForm
and everything looks fine -- except the function f2[a,x] will not
evaluate inside the Table[ ]. I don't understand this -- help in
understanding will be much appreciated.
siegman at ee.stanford.edu