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MathGroup Archive 2004

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Re: Forcing a Derivative

  • To: mathgroup at smc.vnet.net
  • Subject: [mg50778] Re: Forcing a Derivative
  • From: Karl_boehme_9 at msn.com (Klaus G)
  • Date: Sun, 19 Sep 2004 21:39:59 -0400 (EDT)
  • References: <cijej8$hlp$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

> ...
> Derivative[2][f * g]
> just puts a couple of primes on the product rather than actually computing the dervative.
> Thanks for any insight.
> Cheers, Scott

Hi,

f is NOT f[x], so please try:

deriv = D[f[x]*g[x], {x, 2}]
Collect[deriv, x]

regards
Klaus G.


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