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MathGroup Archive 2000

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collect derivatives

  • To: mathgroup at smc.vnet.net
  • Subject: [mg23259] collect derivatives
  • From: Robert <robert.schuerhuber at gmx.at>
  • Date: Sat, 29 Apr 2000 22:05:02 -0400 (EDT)
  • Organization: Vienna University of Technology, Austria
  • Sender: owner-wri-mathgroup at wolfram.com

is there a way to use "collect[]" to collect all terms with a specific
derivative, e.g. to produce something like

z''[x] u[x] + z'[x] (u'[x]+u[x]) + z[x]

?

thanks, robert



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