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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: 3,671
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.

Humans are the only creatures that won't live up to the their potential. Give everything your all. When you die, die on E.

So I ask you, what do you intend to do now?
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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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