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MathGroup Archive 2012

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Re: extract only positive solutions

  • To: mathgroup at smc.vnet.net
  • Subject: [mg125030] Re: extract only positive solutions
  • From: andres <jarosham at gmail.com>
  • Date: Sat, 18 Feb 2012 06:27:43 -0500 (EST)
  • Delivered-to: l-mathgroup@mail-archive0.wolfram.com
  • References: <jhldd0$oql$1@smc.vnet.net>

I don't fully understand, NSolve (or any solver) gives the solutions
as a set of rules, not as a list of numbers.
>From your example I guess you want to extract the pairs whose first
element is > 0. If that's the case I'd use Select:
Select[sol, #[[1]] > 0 &]
Andr=E9s

On Feb 17, 6:24 am, Gabby Domingo <gbdomi... at gmail.com> wrote:
> hi all! how do you extract only positive solutions to a solver, like
> NSolve?
>
> sol={{-.532,.932},{.34,23}}
>
> and extract {.34,.23}?




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