Tutorial 6 queues & arrays & results recording

Feb 6, 2012Download as pptx, pdf2 likes7,166 views

The document describes various container classes in C++ like cQueue, cArray, and histograms that can be used for recording simulation data in OMNeT++. It provides examples of using cOutVector to record time series node energy data, cHistogram to record node lifetime in a histogram, and the eventlog file to view events in a sequence chart. These classes and techniques allow modeling and visualization of simulation results in OMNeT++.

 cQueue is a container class that acts as a queue.
 The basic cQueue member functions:
 insert(obj), inserts an object into the queue head.
 pop(), returns and removes object from the front.
 remove(obj), removes that object from the queue.
 length(), returns the number of items in the queue.
 empty(), tells whether there is anything in the queue.
 insertBefore(obj_where, obj_what)
 insertAfter(obj_where, obj_what)
 front(), returns pointer to the object at the front.
 back() , returns pointer to the object at the back.

 cArray is a container class that holds objects derived from cObject.
 cArray works as an array, but it grows automatically when it becomes
full.
 The basic usage:
 cArray array("array"); // Creating an array
 int index = array.add( obj ); // Adding an object
 int index = array.find(obj);// Finding an object
 array.remove (obj)// Remove an object

 Iteration
for (int i=0; i<array.size(); i++)
{
if (array[i]) // is this position used?
{
}
}

 There are two main types of outputs: vectors and
scalars.
 output vectors are to record time series data and
output scalars are supposed to record a single value per
simulation run.
 Let’s record the node power after every transmission
operation. To do that add the following:
1. cOutVector TxEnergy;// in Node.h
2. TxEnergy.setName("NodePower");// in Node.cc (initialize())
3. TxEnergy.record(energy);// after updating node energy
 Save, build, and run.

 A folder called “results” will be generated.

 Click one of VEC files to generate an analysis file (.anf).
 Select “result” as parent folder -> name it-> click finish.

 Click Wildcard to add all other VEC files in single ANF
file.

 Browse data to get the following results

 You may want to record the distribution as a histogram
(not as a time series).
 Syntax: cHistogram hData;
 hData.collect(value);// to insert a new value.
 Other functions can be used to get the statics, for
example:
hData.getCount(), hData.getMin(),
hData.getMax(), hData.getMean(),
hData.getStddev(), hData.getVariance(),
hData.getSum(), hData.getSqrSum().

 Let’s record node life time, which is the time that a
node takes before it dies:
1. At Node.h

2. At Node.cc

 Save, Build and run

 Play with the properties to get:

 An eventlog file contains a log of messages sent during
the simulation and the details of events that prompted
their sending or reception.
 The Sequence Chart displays eventlog files in a
graphical form.
 Add: record-eventlog = true # In omnetpp.ini

 Save and run.

 ELOG files will be generated.

 Double-Click one of them to watch the sequence chart.

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Tutorial 6 queues & arrays & results recording

1. By Mohammed Amer Al-Batati 2012

2.  cQueue is a container class that acts as a queue.  The basic cQueue member functions:  insert(obj), inserts an object into the queue head.  pop(), returns and removes object from the front.  remove(obj), removes that object from the queue.  length(), returns the number of items in the queue.  empty(), tells whether there is anything in the queue.  insertBefore(obj_where, obj_what)  insertAfter(obj_where, obj_what)  front(), returns pointer to the object at the front.  back() , returns pointer to the object at the back.

3.  cQueue Example:  Iterators

4.  cArray is a container class that holds objects derived from cObject.  cArray works as an array, but it grows automatically when it becomes full.  The basic usage:  cArray array("array"); // Creating an array  int index = array.add( obj ); // Adding an object  int index = array.find(obj);// Finding an object  array.remove (obj)// Remove an object  Iteration for (int i=0; i<array.size(); i++) { if (array[i]) // is this position used? { } }

5.  There are two main types of outputs: vectors and scalars.  output vectors are to record time series data and output scalars are supposed to record a single value per simulation run.  Let’s record the node power after every transmission operation. To do that add the following: 1. cOutVector TxEnergy;// in Node.h 2. TxEnergy.setName("NodePower");// in Node.cc (initialize()) 3. TxEnergy.record(energy);// after updating node energy  Save, build, and run.

6.  A folder called “results” will be generated.  Click one of VEC files to generate an analysis file (.anf).  Select “result” as parent folder -> name it-> click finish.

7.  Click Wildcard to add all other VEC files in single ANF file.  Browse data to get the following results

8.  You may want to record the distribution as a histogram (not as a time series).  Syntax: cHistogram hData;  hData.collect(value);// to insert a new value.  Other functions can be used to get the statics, for example: hData.getCount(), hData.getMin(), hData.getMax(), hData.getMean(), hData.getStddev(), hData.getVariance(), hData.getSum(), hData.getSqrSum().

9.  Let’s record node life time, which is the time that a node takes before it dies: 1. At Node.h 2. At Node.cc

10.  Save, Build and run  Play with the properties to get:

11.  An eventlog file contains a log of messages sent during the simulation and the details of events that prompted their sending or reception.  The Sequence Chart displays eventlog files in a graphical form.  Add: record-eventlog = true # In omnetpp.ini  Save and run.

12.  ELOG files will be generated.  Double-Click one of them to watch the sequence chart.

Tutorial 6 queues & arrays & results recording

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