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 Author Comment/Response Aaron Honecker 09/13/00 1:51pm >I need help for relatively an easy problem;> >I am solving the following system of equations: > >Solve[{Lamda1 - Lamda2 == 0, Lamda2 - Lamda3 == 0, Lamda3 - Lamda4 == 0, > Lamda4 - Lamda5 == 0}, {x11, x12, x13, x14}] > >and it gives me more than 100 solutions. However, I want to have only >positive ones. In this case, there is only one solution that all variables >are positive. In order to find out this solution, I am doing an inspection >by eyes. I wanna ask whether there is anyway that I can do the inspection >in the search of positive solutions only using Mathematica commands? That is, I just wanna pick positive solution(s) if any... > >Thanks... One way that you can extract the positive solutions is with the following: S=Solve[{Lamda1 - Lamda2 == 0, Lamda2 - Lamda3 == 0, Lamda3 - Lamda4 == 0, Lamda4 - Lamda5 == 0}, {x11, x12, x13, x14}] Cases[S, {x11 -> _?Positive, x12 -> _?Positive, x13 -> _?Positive, x14 -> _?Positive}] This will extract all solutions (if any) where x11, x12, x13, x14 are all positive URL: ,

 Subject (listing for 'postive solutions') Author Date Posted postive solutions Mehmet 09/13/00 06:38am Re: postive solutions Aaron Honecker 09/13/00 1:51pm
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