
vs_random_index(+VS, -I)

   Retrieve a random variable index from a varset

Arguments
   VS                  A varset
   I                   An integer (output)

Type
   library(tentative)

Description

	Retrieve a random variable index from a varset.
    

Modes and Determinism
   vs_random_index(+, -) is semidet

Examples
   
    ?- Vars=[A,B,C], tent_set(Vars, [a,b,c]), vs_create(Vars, VS),
       vs_random_index(VS, I).
    Vars = [A{a -> 0}, B{b -> 0}, C{c -> 0}]
    VS = ...
    I = 1		% 1, 2 or 3, the result is random!
    Yes (0.00s cpu)
    

See Also
   vs_create / 2, vs_element / 3, vs_random / 2
