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distri.cpp
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distri.cpp
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/*******************************************************************
*
* DESCRIPTION: class Distribution
*
* AUTHOR: Amir Barylko & Jorge Beyoglonian
*
* EMAIL: mailto://amir@dc.uba.ar
* mailto://jbeyoglo@dc.uba.ar
*
* DATE: 27/6/1998
*
*******************************************************************/
/** include files **/
#include <ctime>
#include <cstdlib>
#include "distri.h" // class definition
#include "strutil.h" // lowercase
extern "C"
{
#include "randlib.h"
}
using namespace std;
/** public functions **/
/*******************************************************************
* Function Name: create
********************************************************************/
Distribution *Distribution::create( const string &distributionName )
{
string name = lowerCase( distributionName );
if( name == "chi" )
return new( ChiDistribution );
if( name == "constant" )
return new( ConstantDistribution ) ;
if( name == "normal" )
return new( NormalDistribution ) ;
if( name == "exponential" )
return new( ExponentialDistribution ) ;
if( name == "poisson" )
return new( PoissonDistribution ) ;
InvalidDistribution e;
e.addText( "Invalid Distribution Type: " + distributionName ) ;
MTHROW( e ) ;
}
/*******************************************************************
* Function Name: Distribution
* Description: Constructor
********************************************************************/
Distribution::Distribution()
{
time_t seconds;
time( &seconds );
srand( seconds );
string str ;
char c ;
for ( register int i = 1 ; i <= 20 ; i++ )
{
#ifndef DEVS_NOTRANDOM
c = 50 + rand()%50;
#else
//For testing purposes, it may be useful to allways have the same sequence of
//random numbers. By using allways the same seed, this can be achieved.
c = 50 + i;
#endif
str += c;
}
long seed1;
long seed2;
// create the seeds
phrtsd( const_cast< char *>( str.c_str() ), &seed1, &seed2 );
setall( seed1, seed2 );
}
/*******************************************************************
* Function Name: getVar
********************************************************************/
const string Distribution::getVar( unsigned int varIndex ) const
{
if ( (int) varIndex >= this->varCount() )
{
MException e( string("Invalid Variable Index: ") + (int)varIndex );
MTHROW( e ) ;
}
return get(varIndex);
}
/*******************************************************************
* Function Name: setVar
********************************************************************/
Distribution &Distribution::setVar( unsigned int varIndex, float value )
{
if ( (int) varIndex >= varCount() )
{
MException e( string("Invalid Variable Index: ") + static_cast<int>( varIndex ) );
MTHROW( e ) ;
}
return set(varIndex, value);
}
/*******************************************************************
* Function Name: set
********************************************************************/
Distribution &NormalDistribution::set( unsigned int index, float value )
{
if( index == 0 )
mean = value ;
else
deviation = value ;
return *this ;
}
float ChiDistribution::get()
{
return genchi(df);
}
float NormalDistribution::get()
{
return gennor(mean, deviation);
}
float PoissonDistribution::get()
{
return ignpoi( mu );
}
float ExponentialDistribution::get()
{
return genexp( av );
}