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Re: extract only positive solutions

  • To: mathgroup at smc.vnet.net
  • Subject: [mg125020] Re: extract only positive solutions
  • From: Bill Rowe <readnews at sbcglobal.net>
  • Date: Sat, 18 Feb 2012 06:24:14 -0500 (EST)
  • Delivered-to: l-mathgroup@mail-archive0.wolfram.com

On 2/17/12 at 6:23 AM, gbdomingo at gmail.com (Gabby Domingo) wrote:

>hi all! how do you extract only positive solutions to a solver, like
>NSolve?

>sol={{-.532,.932},{.34,23}}

>and extract {.34,.23}?

Here is an example of one way

In[3]:= p = (x + 3) (x - 4) (x - 5) // Expand;

In[4]:= Cases[Solve[p == 0, x], {_?(x > 0 /. # &)}]

Out[4]= {{x->4},{x->5}}




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