ii38scope.htm
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<title>II.3.8. Scope</title>
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<p class=heading-2>II.3.8. Scope</p>
<p class=heading-2-p> </p>
<p align="justify" class=normal>The <b><i>Scope</i></b> facility opens a new MATLAB
window (<a href="#FigII12">fig. II.12</a>) that displays (dynamically) the evolution
of the selected performance index. Each index provides two types of information,
namely a current value (that characterizes the PN at the current moment of the
simulation) and a global value (that characterizes the whole evolution of the
PN, as an average over the whole time-horizon from the beginning of the simulation
till the current moment). For the selected performance index, both current and
global values are plotted versus time.</p>
<p align="justify" class=normal> </p>
<p align="justify" class=normal> The usage of the <b><i>Scope</i></b> facility
is available only for timed PNs in the <b><i>Step</i></b> and <b><i>Run Slow</i></b>
simulation modes.</p>
<br><p align="center" class=normal><img ID="FigII12" border=0 src="_PNToolbox-16.jpg"></p>
<p align="center" class=figura>Fig II.12. <i>The </i><b><i>Scope</i></b> <i>window</i>.</p>
<br>
<p class=normal>The current/global performance indices displayed by <b><i>Scope</i></b> are:</p>
<p class=normal>-</p><p class=normal style="margin-left: 18pt; margin-top: -12pt;">for a transition:</p>
<p class=normal style="margin-left: 36pt;">•</p><p class=normal style="margin-left: 47.35pt; margin-top: -12pt;"><b><i>Service Distance</i></b>: means the duration between two successive firings of the selected transition;</p>
<p class=normal style="margin-left: 36pt;">•</p><p class=normal style="margin-left: 47.35pt; margin-top: -12pt;"><b><i>Service Time</i></b>: means the duration between the enabling and the firing of the selected transition;</p>
<p class=normal style="margin-left: 36pt;">•</p><p class=normal style="margin-left: 47.35pt; margin-top: -12pt;"><b><i>Utilization</i></b>: means the current status of the selected transition: 1 for the time-interval between the enabling and the firing of the selected transition; 0 otherwise;</p>
<p class=normal>-</p><p class=normal style="margin-left: 18pt; margin-top: -12pt;">for a place:</p>
<p class=normal style="margin-left: 36pt;">•</p><p class=normal style="margin-left: 47.35pt; margin-top: -12pt;"><b><i>Arrival Distance</i></b>: means the duration between two successive instants when tokens arrive in the selected place;</p>
<p class=normal style="margin-left: 36pt;">•</p><p class=normal style="margin-left: 47.35pt; margin-top: -12pt;"><b><i>Throughput Distance</i></b>: means the duration between two successive instants when tokens leave the selected place;</p>
<p class=normal style="margin-left: 36pt;">•</p><p class=normal style="margin-left: 47.35pt; margin-top: -12pt;"><b><i>Queue Length</i></b>: means the number of tokens in the selected place.</p>
<p class=normal> </p>
<p align="justify" class=normal>During a simulation experiment, only one of the
six performance indices can be dynamically displayed by the <b><i>Scope</i></b>.
The red color is automatically set for plotting the evolution of the global
performance index. The blue color is automatically set for plotting the evolution
of the current performance index. The final value shown by the <b><i>Scope</i></b>
for the global performance index is identical to the value displayed on request,
at the end of simulation, by accessing the <b><i><a href="i26performancemenu.htm">Performance</a></i></b>
menu.</p><hr>
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