Re: how to replace with definition
- To: mathgroup at smc.vnet.net
- Subject: [mg123699] Re: how to replace with definition
- From: Bob Hanlon <hanlonr357 at gmail.com>
- Date: Fri, 16 Dec 2011 05:44:13 -0500 (EST)
- Delivered-to: l-mathgroup@mail-archive0.wolfram.com
- References: <201112150953.EAA22870@smc.vnet.net>
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.schantz 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.
>
- References:
- how to replace with definition
- From: r_poetic <radford.schantz@mms.gov>
- how to replace with definition