Re: Extracting solutions from Solve[]

*To*: mathgroup at smc.vnet.net*Subject*: [mg82573] Re: Extracting solutions from Solve[]*From*: Steven Siew <siewsk at bp.com>*Date*: Thu, 25 Oct 2007 06:05:01 -0400 (EDT)*References*: <ffn0bv$5o0$1@smc.vnet.net>

On Oct 24, 6:39 pm, "Isaac Martinez G." <isaac.marti... at sbcglobal.net> wrote: > Hello group: > New guy to Mathematica and I am using the Solve function to find all the roots of a non linear set of equations. I do not have a function that selects positive solutions between 0 and 1 But I do have a select positive function. SelectPositive[soln_] := Select[soln, Apply[And,Map[Abs[Part[#, 2]] == Part[#, 2] &, #]] & ] In[4]:= Solve[4 x^2 - 6 x - 9 == 0, x] // SelectPositive Out[4]:= {{x->3/4 (1+Sqrt[5])}} > My question is once I have all the solution I am getting rid of all the complex ones and then I need to keep the ones that are within the interval [0,1]. > I have the following nested list after removing complex values: > {{}, {}, {}, {}, {}, {}, {}, {}, { > 1., -0.357968, -0.0366376}, {1., -0.357968, -0.0366376}, {}, {}, {}, {}, \ > {0.326026, -0.812319, 0.0112833}, {-0.791102, > 0.283189, 0.0113524}, {}, {}, {0.454731, 0.840435, 0.0318799}, {}, {}, \ > {0.999998, > 1.8482, 1.63961}, {0.999997, 1.8482, 1.63962}, {0.998429, -2.49158, > 3.06313}, {0.999101, -2.49158, 3.06323}} > > I need to take the solution/group that is within [0,1]. > How do you do this?? > Any help is appreciated....no luck so far...