Re: how to replace with definition
- To: mathgroup at smc.vnet.net
- Subject: [mg123845] Re: how to replace with definition
- From: r_poetic <radford.schantz at mms.gov>
- Date: Thu, 22 Dec 2011 04:29:16 -0500 (EST)
- Delivered-to: l-mathgroup@mail-archive0.wolfram.com
- References: <201112150953.EAA22870@smc.vnet.net> <jcf813$6qk$1@smc.vnet.net>
On Dec 16, 5:54 am, Bob Hanlon <hanlonr... at gmail.com> wrote: > k[t] = A[t]/L[t]; > > L'[t] = lambda L[t]; A'[t] = s k[t]^alpha; > > D[k[t], t] /. A[t] -> HoldForm[k[t]]*L[t] > > % // ReleaseHold > > Bob Hanlon > > > > > > On Thu, Dec 15, 2011 at 4:53 AM,r_poetic<radford.scha... at mms.gov> wrote: > > Hello, > > I can't seem to manage this replacement: > > > k[t] = A[t]/L[t]; > > > L'[t] = lambda L[t]; A'[t] = s k[t]^alpha; > > > D[k[t],t] > > > output= lambda A[t] + s (A[t]/L[t]) ^ alpha > > ----------------- ------------------= --= > --------- > > L[t] = = > L[t] > > > How can the ratio A[t]/L[t] be replaced with k[t] here? I have tried > > a number of possibilities using /. or Replace.- Hide quoted text - > > - Show quoted text - Thanks to all! Hold-ing works great. RS
- References:
- how to replace with definition
- From: r_poetic <radford.schantz@mms.gov>
- how to replace with definition