People,

I'm researching some Bayesian statistic topics and in the midle of my study
i found a very simple problem and i'm trying to find a simple package to
solve this type of equations:

Lets say that i need to compute beta values for the beta distribution and i
now for example:

E(teta)=a/(a+b) = 0,5
Var(teta)=ab/((a+b)^2(a+b+1))=0.05

So if i want to solve this to non-linear system to find a,b for the beta
distribution wich pack should i use?

I know that a=2 and b=2 because i calculated it. 

Can someone help?

Thanks,
Eliano

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