what's wrong with :
map(lambda S:map(lambda s:s.lhs()==s.rhs().n(), S), solve([eq1, eq2, eq3],
[x, y, z]))
[[x == 0.0675142263037092, y == 0.00748577369629076, z ==
0.00748577369629076],
[x == 0.0833157736962908, y == -0.00831577369629076, z ==
-0.00831577369629076]]
Which shows that the first solution fulfills your constraints ?
HTH,
--
Emmanuel Charpentier
Le jeudi 21 septembre 2017 20:27:43 UTC+2, Natalie Ulrich a écrit :
>
> I'm using SageMathCell to solve chemical equilibrium problems, so at least
> one set of my solutions has to be real and positive.
>
> Here's my code:
>
> var('x, y, z')
>
> xi=0
>
> yi=0.150/2.0
>
> zi=0.150/2.0
>
> K=8.3e-4
>
> eq1=K == y*z/ x
>
> eq2=xi+yi==x+y
>
> eq3=2*xi+2*zi==2*x+2*z
>
> solve([eq1, eq2, eq3],[x, y, z])
>
>
>
> And here are my solutions:
>
> [[x == -1/200000*sqrt(2496889) + 15083/200000, y == 1/200000*sqrt(2496889)
> - 83/200000, z == 1/200000*sqrt(2496889) - 83/200000], [x ==
> 1/200000*sqrt(2496889) + 15083/200000, y == -1/200000*sqrt(2496889) -
> 83/200000, z == -1/200000*sqrt(2496889) - 83/200000]]
> ------------------------------
>
>
> Any thoughts? Thanks in advance.
>
>
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