Re: How to choose real positive solutions only?
- To: mathgroup at smc.vnet.net
- Subject: [mg74470] Re: How to choose real positive solutions only?
- From: Terry <tharter at attglobal.net>
- Date: Thu, 22 Mar 2007 01:15:56 -0500 (EST)
Manfred, Let's say that your complex answers are in a variable called 'ans' that is a list of the form a-> x + iy Then do something like realAns := ans a/. Select[ans,(FreeQ[#,Complex])&] HTH .....Terry Dix, Manfredo A wrote: >Hello, >this question probably came up before, but anyway: > >suppose I have a system of 3 equations and 3 unknowns, >which I want to solve numerically with NSolve. >They are polynomial of degree "n" so that I get n solutions. > >Is there a way to tell Mathematica to just return the >real positive solutions, and dismiss the imaginary and negative >ones? > >thank you so much for any help, >cordially, > >Manfred >mdix at tulane.edu > > > >