Re: functional notation
- To: mathgroup at smc.vnet.net
- Subject: [mg26044] Re: [mg26034] functional notation
- From: Andrzej Kozlowski <andrzej at tuins.ac.jp>
- Date: Sat, 18 Nov 2000 23:07:59 -0500 (EST)
- Sender: owner-wri-mathgroup at wolfram.com
Why not simply use: In[169]:= (D[f[x], x]*D[x[t], t] /. x -> Function[t, a*t]) /. Function[t, a*t] -> x Out[169]= a f'[x] -- Andrzej Kozlowski Toyama International University JAPAN http://platon.c.u-tokyo.ac.jp/andrzej/ http://sigma.tuins.ac.jp/ on 00.11.17 6:07 PM, Blimbaum Jerry DLPC at BlimbaumJE at ncsc.navy.mil wrote: > 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 > > > > >