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Re: How to choose real positive solutions?

• To: mathgroup at smc.vnet.net
• Subject: [mg74307] Re: [mg74291] How to choose real positive solutions?
• From: Bob Hanlon <hanlonr at cox.net>
• Date: Sun, 18 Mar 2007 00:44:43 -0500 (EST)
• Reply-to: hanlonr at cox.net

soln = NSolve[eqns, x];

Select[soln,FreeQ[x/.#,Complex]&&(x/.#)>0&]


Bob Hanlon

---- mandix <mdix at tulane.edu> wrote: 
> Hi,
> suppose I want to solve a system of 3 equations and 3 unknowns
> (polynomial of degree whatever, say n). Is there a way to tell NSolve
> to return only real and positive solutions (and ignore the rest)?
> 
> thanks you so much,
> 
> Manfred