
vs_random_worst_index(+VS, -Var)

   Retrieve a worst violated variable index from a varset

Arguments
   VS                  A varset
   Var                 An integer (output)

Type
   library(tentative)

Description

	Retrieve a variable index from a varset whose violation count is
	maximal in the varset. In case of ties, a random candidate
	is returned.
    

Modes and Determinism
   vs_random_worst_index(+, -) is semidet

Fail Conditions
   Fails if there is no violated variable in the set

Examples
   
    ?- Vars=[A,B,C], tent_set(Vars, [1,2,3]), vs_create(Vars, VS),
       var_inc_violations(A, 2),
       var_inc_violations(B, 1),
       var_inc_violations(C, 2),
       vs_random_worst(VS, Worst).
    Vars = [A{1 -> 2}, B{2 -> 1}, Worst{3 -> 2}]
    VS = ...
    Worst = 1       % 1 or 3, the result is random!
    Yes (0.00s cpu)
    

See Also
   vs_all_worst_index / 2, vs_worst_index / 2, vs_random_worst / 2
