Re: Solve and using the solutions further
- To: mathgroup at smc.vnet.net
- Subject: [mg38298] Re: Solve and using the solutions further
- From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
- Date: Thu, 12 Dec 2002 01:31:19 -0500 (EST)
- Organization: Universitaet Leipzig
- References: <at4c5l$eno$1@smc.vnet.net>
- Reply-to: kuska at informatik.uni-leipzig.de
- Sender: owner-wri-mathgroup at wolfram.com
Hi, a small example sol = Solve[{0 == x^2 + y, -1 == x + y}, {x, y}]; and Select[sol, (x /. #) > 0 &] will return the solution with positive x. Regards Jens Angela Birk wrote: > > Hi, > I am trying to solve 3 equations on 3 variables --- which is solveable. > After that I want to use only the positive solutions of the three > variables for further calculations. I tried to use the Select command in > connection with the Solve command, but I get only an empty list. > > Could you help by recommend commands? > > Thank you in advance. > Regards > Angela Birk > > -- > Angela Birk > University of Hamburg > HWWA > Economics > 20347 Hamburg, Germany > +49 40 42834 - 478