Class RandomVar

constructor

• new RandomVar(seed?: number): RandomVar

• Initializes a new instance of the RandomVar class.

  Parameters

  • seed: number = null

    Optional value used to initialize the random sequence.

    If you omit the seed value, a random seed will be generated automatically and the random sequences will be different every time you run the simulation. If you do provide a seed value, be careful to avoid unintended correlations between different random variables. For example:

    // M/M/1: https://en.wikipedia.org/wiki/M/M/1_queue
    export class MM1 extends Simulation {
    
        // service times are exponentially distributed with mean 10 min and seed 1:
        serviceTime = new Exponential(10, 1);
    
        // inter-arrival times are exponentially distributed with mean 15 min
        // and the seed is 2 (to avoid correlations with the service times):
        this.interArrival = new Exponential(15, 2);
    
        // System and Server queues
        system = new Queue('System');
        server = new Queue('Server', 1);
    
        onStarting() {
            super.onStarting();
            this.generateEntities(MM1Entity, this.interArrival, 1e4);
        }
    }
    class MM1Entity extends Entity<MM1> {
        async script() {
            const sim = this.simulation;
            this.enterQueueImmediately(sim.system);
            await this.enterQueue(sim.server);
            await this.delay(sim.serviceTime.sample());
            this.leaveQueue(sim.server);
            this.leaveQueue(sim.system);
        }
    }
    

  Returns RandomVar