On Wed, Jun 26, 2019 at 8:18 PM Chou Yan <yan.chou.str...@gmail.com> wrote:

> I fix it by :
>
> var w = weighted.NewRandW()
>

Insufficient context to understand what that does. Let alone how it "fixes"
the problem since you haven't shown us your `NewRandW()` function. In
general you should never initialize a RNG more than once unless you are
doing so to create a reproducible sequence of values. In which case you
should be initializing it with a constant value rather than a pseudo-random
value like `time.Now().Unix()`.

-- 
Kurtis Rader
Caretaker of the exceptional canines Junior and Hank

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