## EZStrobe Queues & Properties
The ACD fragment below shows a Queue that is initialized with 16
resources. This Queue has two In the ACD above, only the name of the Queue and its initial content are
specified in the
As a simulation proceeds, a Queue collects statistics that are calculated on the basis of a graph of Queue content as a function of simulation time like the one shown below: The graph above extends from simulation time 0 to simulation time 1.9. Imagine that the graph is drawn by initially setting the pencil down at point (0,0) and then drawing as indicated by the arrow heads without ever lifting the pencil up. The table below shows Queue statistics, how they are calculated, and
how they can be accessed in formulas (shown in parenthesis below the Queue
statistic name). For the example calculations in this table, it is necessary to know "the area under
the graph" (15.1 res-time units) as well as the area under a graph of the
content squared (126.3 res
EZStrobe can collect more detailed statistics about Queues than those mentioned above. If Microsoft Excel is available, EZStrobe can also create a chart of Queue content as a function of time. The Queue Properties form has two pages. To invoke it, double-click the
Queue. The first page, The Queue Statistics Graph above is an example of a
customized chart. The graphs
produced by EZStrobe include markers for each point and a thick line type,
which make these graphs attractive only when they contain a handful of data
points. Hiding point markers and reducing the portion of the graph that is
visible by adjusting the x-axis properties are typically necessary to make
these graphs attractive.The
field are created between the Bins and From
values. Underflow and overflow bins are also created.
The binned statistical output will appear in the simulation report in the Stroboscope IDE
and, for 14 bins between 4 and 18, will look as follows:To Content
TotTime %Time The output above indicates, for example, that the percentage of time that the Queue contained less than 7 resources was 26.32%, and that the total time that the Queue content was greater than or equal to 7 but less than 8 was 0.85-0.50=0.35 time units.
The second page of the Integral Statistics page for the model used in
Multi-Step Activities in EZStrobe
- 2, Non Identical or Non Consecutive Steps
is shown below. Please see that page for a detailed explanation of Integral
Statistics. In essence, rather than plotting Queue contents as a function of
time, the Integral Statistics option first divides the Queue contents by Divisor
and then graphs only the integer portion of the result. |
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University of Michigan | College of Engineering | Civil & Envir. Engineering Dept. | CE&M - TCMP | Acrobat Reader This page last updated by P.G. Ioannou on 08/22/18. Copyright © P.G. Ioannou. |