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functional notation

  • To: mathgroup at smc.vnet.net
  • Subject: [mg26034] functional notation
  • From: Blimbaum Jerry DLPC <BlimbaumJE at ncsc.navy.mil>
  • Date: Fri, 17 Nov 2000 04:07:44 -0500 (EST)
  • Sender: owner-wri-mathgroup at wolfram.com

	When I type in the following 2 lines:


	D[f[x],x]*D[x[t],t];

	%/.{x->Function[t,at]

	I get back

	a * f ' [Function[t, at ] ]   but what I want to get back is   a*f '
[t]    or    a*f ' [x]

	I'm trying to do something with just functional notation and I want
certain derivatives to 'stay as is' once they are computed..I've looked at
Hold,etc. and dont know how to use them or even if they are the correct way
to go.


	thanks....Jerry Blimbaum   NSWC  Panama City, Fl






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