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Old 12-07-2013, 06:36 AM   #1
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Join Date: Dec 2013
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Default Arena 12 Rockwell: Create Module

Hi guys,

I have a problem with Rockwell Arena 12.

I'd like to create a "Shopping model" for a supermarket, with an Entrance (create), shopping process (delay), n different cash points(process) and an exit(dispose).

To determine the distribution of the arrival times I divided the arrival rates in 15 minutes time intervals (8:00 am, 8:15am, 8:30am...22:00pm) for each weekday (monday, tuesday.. saturday).

Now i want to write an expression in the create module which should "check on/search for" the actual weekday and time interval.
here an example(not an arena expression!):

IF(weekday(TNOW)=="monday" && Time Inverval(TNOW) >=08:00am && Time Interval(TNOW) <=08:15) THEN normal distribution (0.7,0.15)

IF(weekday(TNOW) == "monday" && Time Interval(TNOW) >= 08:15am &&Time Interval(TNOW) <= 08:30) THEN normal distribution (0.6,0.15)


IF(weekday(TNOW)=="saturday"&&Time Interval(TNOW)>=21:45pm &&Time Interval(TNOW) <= 22:00pm) THEN normal distribution (0.4,0.05)

I hope u guys understand what i am trying to achieve with that statement and somebody can help me to find a solution.

Thanks for your help!

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Old 12-07-2013, 12:57 PM   #2
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Posts: 3,908
Default Re: Arena 12 Rockwell: Create Module

Caught me on a lazy Saturday .
Here's a C# example of how I would accomplish this. Hopefully you can understand, modify, improve for whatever Arena is...

using System;
using System.Collections.Generic;

namespace TestApp
    class Program
        public static int timeIntervals = 56; //four intervals per hour
        public static double weekdayDistribution = .15; //I assumed these were based on weekdays
        public static double weekendDistribution = .05;
        public static DateTime timeNow = DateTime.Now;
        public static TimeSpan openingHours = new TimeSpan(8,0,0);
        public static DateTime startTime = timeNow.Date + openingHours;
        public static TimeSpan closingHours = new TimeSpan(22, 0, 0); //10pm close time
        public static DateTime finishTime = timeNow.Date + closingHours;
        public static double[] finalDistribution = { 0, 0 };
        public static string MessageToShopper; //Demonstration only
        public static List<DayOfWeek> weekendDays = new List<DayOfWeek> { DayOfWeek.Sunday, DayOfWeek.Saturday };

        static void Main(string[] args)

            if (timeNow >= startTime && timeNow <= finishTime) 
                if (weekendDays.Contains(timeNow.DayOfWeek))
                    finalDistribution[0] = FindTheFirstDistributionInFifteenMinuteIntervals();
                    finalDistribution[1] = weekendDistribution;
                    finalDistribution[0] = FindTheFirstDistributionInFifteenMinuteIntervals();
                    finalDistribution[1] = weekdayDistribution;

                MessageToShopper = "You get " + finalDistribution;
                MessageToShopper = "We're freaking closed!";

            //TODO: Something with the MessageToShopper or the finalDistribution
        public static double FindTheFirstDistributionInFifteenMinuteIntervals()
            double distribution = 0;

            bool foundIt = false;

            for (var i = timeIntervals; !foundIt; i--)
                var reverseCounter = timeIntervals - i;
                DateTime windowOfTime = startTime.AddMinutes(reverseCounter * 15);

                if (timeNow >= windowOfTime && timeNow <= windowOfTime.AddMinutes(15))
                    distribution = DetermineFirstDistribution(reverseCounter);                    
                    foundIt = true;

            return distribution;
        public static double DetermineFirstDistribution(int reverseCounter)
            //This is where you determine the first distribution value
            //based on the number of 15 minute intervals that have passed. 

            if (reverseCounter > 50)
                return 7;
            else if (reverseCounter > 40)
                return 6;
            else if (reverseCounter > 30)
                return 5;
            else if (reverseCounter > 20)
                return 4;
            else if (reverseCounter > 10)
                return 3;
                return 2;
EDIT: The goal here was to separate the calculations of the two return numbers. You could then simply evaluate on whether or not it's a weekend day and truncate the code even more.

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Old 12-17-2013, 05:34 AM   #3
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Posts: 5
Default Re: Arena 12 Rockwell: Create Module

yeah thanks mate, but i need it for ARENA, its a simulation software..

does anyone else know how i could do that without a DECION module?
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Old 12-17-2013, 08:33 AM   #4
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Default Re: Arena 12 Rockwell: Create Module

I bet there are more specific forums for this software. I doubt anyone here has any experience with it.
Don't take life too seriously -- no one gets out alive. Plus, who wants to arrive to the hereafter in pristine condition wearing a suit and tie?
I want to slide in sideways, worn out, used up, hair a mess, clothes tattered, & screaming, "Whooo! What a ride!"
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Old 02-13-2014, 02:47 PM   #5
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Posts: 11
Default Re: Arena 12 Rockwell: Create Module

I can help you, you have to use 1 Create module for each day of the week. Choose the option "Schedule" and enter Duration = 1 and the specific arrival rate.
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arena, if-statement, rockwell

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