define a new nedfunction in omnet++

[Kortas Manel]

Hi, I have to implement a random bidirectional topologie , I tried to follow this : http://www.khyber.org/tech/a/Random_Generation_of_bi-direct.shtml
But I didn't know how to define a new nedfunction , help please !!!

[Pedro Yébenes Segura]

Hello,
you should read this http://www.omnetpp.org/doc/omnetpp/manual/usman.html#sec301

Regards,

[Kortas Manel]

Hi again,
I saw omnett++ tutorial yesterday, but there are some points that I did not understand, the first is where shoud I define the ned function, shoud I create a new source file (.cc) ?? 
the second is when I put this code in a new source file :
#include <cnedvalue.h>
#include<essai3.h>

double runiform(double rng) {
  static int r = 0;
  static double l = 0;
  if(r%2 == 0) l = uniform(0,1);
  r++;
  return l;
}
static cNEDValue runiform(cComponent *context, cNEDValue argv[], int argc)
{
 double rng = argc==2 ? (int)argv[1] : 0;
 return cNEDValue(runiform(rng), argv[0].getUnit());
}
Define_NED_Function(runiform, "quantity runiform(int rng?)", "random/continuous", "Retains the value generated from a previous call to uniform()");

it generate a syntax error , I didn't know what to do , sorry but I have just one week with omnet++ so I'm beginner.

[Pedro Yébenes Segura]

A separate source file for ned funcions is a good choice.

I think that the problem with your code is to have two functions called "runiform". Try to rename one of them and compile again.

Regards,

[Kortas Manel]

I deleted the other function and my nedfunction.cc file become like this :

double runiform(double rng) {
  static int r = 0;
  static double l = 0;
  if(r%2 == 0) l = uniform(0,1);
  r++;
  return l;
}

Define_NED_Function2(runiform, "quantity runiform(double rng?)", "random/continuous", "Retains the value generated from a previous call to uniform()");

the project generate an error and propose to add runiform and rng to dictionary , shoud I add them or not ??

Tnx Pedro for your responses.

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[Pedro Yébenes Segura]

I have copied your code and the compiler didn't complain in my computer (Ubuntu 14.04 and omnet++ 4.6) changing the include declaration as I don't have <essay3.h>.
Sorry, I don't know what is happening.

#include <omnetpp.h>

double runiform(double rng) {
  static int r = 0;
  static double l = 0;
  if(r%2 == 0) l = uniform(0,1);
  r++;
  return l;
}
static cNEDValue runiform(cComponent *context, cNEDValue argv[], int argc)
{
 double rng = argc==2 ? (int)argv[1] : 0;
 return cNEDValue(runiform(rng), argv[0].getUnit());
}

Define_NED_Function2(runiform, "quantity runiform(double rng?)", "random/continuous", "Retains the value generated from a previous call to uniform()");

[Sultan Mahmud Tusher]

I am trying to put a bimodal gaussian distribution with two different mean and two different variances. I saw in the manual that you can define your own function. I do not know where to write this function and where i have to put in order to use it in the .ini file. I would really appreciate your help in doing that. This is  for .interarrivaltime in queueing system.

Thanks

Tusher