RE: Solving for "Invalid" Variables
- To: mathgroup at smc.vnet.net
- Subject: [mg27716] RE: [mg27569] Solving for "Invalid" Variables
- From: "Higinio Ramos" <higra at gugu.usal.es>
- Date: Tue, 13 Mar 2001 03:52:36 -0500 (EST)
- Organization: usal
- References: <200103070908.EAA05042@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
----- Original Message -----
From: Alan <kd7cyb at mac.com>
To: mathgroup at smc.vnet.net
Subject: [mg27716] [mg27569] Solving for "Invalid" Variables
> Is there a way in Mathematica to solve for "invalid" variables? Example:
>
> Solve[dy+y==dx+x, dy/dx]
>
> This returns a invalid variable error but I want the result to say dy/dx
> is equal to something. Is there a way to do this with rules or anything
> else I may not know of?
>
> Thanks,
> Alan
Perhaps this made what you want:
Solve[Map[Apart, Map[#/dx &, dy + y == dx + x, 1], 1] /. dy/dx -> var,
var] /. var -> dy/dx
Higinio
- References:
- Solving for "Invalid" Variables
- From: Alan <kd7cyb@mac.com>
- Solving for "Invalid" Variables