You don't say how "it doesn't work" but List::Utils min() returns the minimum value not its index. You could use List::MoreUtils first_index() function to then find the index, or adapt one of the solutions in How can I find the index of the biggest element in an array?

In reply to Re: index of the minimum element of the array by tangent
in thread index of the minimum element of the array by Anonymous Monk

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