PMU optimal placement in TLBO

optimal placement of PMU using Particle swarm optimisation yields some better results. but for the same problem, i tried teaching learning based optimisation algorithm. but TLBO gives decimal outputs like [0.45 0.86 0.34 0.55]. but i am in the need of results like [1 0 1 0] or the the cominations like 0 0 1 1 0r 1 1 0 0 like that. how can i can i get it using TLBO ?

and also how to give random inputs 0 and 1 instaed of between 0 and 1