ns3::RandomVariableStream Class Reference

The Random Number Generator (RNG) that allows stream numbers to be set deterministically. More...

#include <random-variable-stream.h>

Inheritance diagram for ns3::RandomVariableStream:

Collaboration diagram for ns3::RandomVariableStream:

Public Member Functions
	RandomVariableStream ()
virtual	~RandomVariableStream ()
virtual uint32_t	GetInteger (void)=0
	Returns a random integer integer from the underlying distribution.
int64_t	GetStream (void) const
	Returns the stream number for this RNG stream.
virtual double	GetValue (void)=0
	Returns a random double from the underlying distribution.
bool	IsAntithetic (void) const
	Returns true if antithetic values should be generated.
void	SetAntithetic (bool isAntithetic)
	Specifies whether antithetic values should be generated.
void	SetStream (int64_t stream)
	Specifies the stream number for this RNG stream.
Public Member Functions inherited from ns3::Object
	Object ()
virtual	~Object ()
void	AggregateObject (Ptr< Object > other)
void	Dispose (void)
AggregateIterator	GetAggregateIterator (void) const
virtual TypeId	GetInstanceTypeId (void) const
template<typename T >
Ptr< T >	GetObject (void) const
template<typename T >
Ptr< T >	GetObject (TypeId tid) const
void	Initialize (void)
Public Member Functions inherited from ns3::SimpleRefCount< Object, ObjectBase, ObjectDeleter >
	SimpleRefCount ()
	SimpleRefCount (const SimpleRefCount &o)
uint32_t	GetReferenceCount (void) const
SimpleRefCount &	operator= (const SimpleRefCount &o)
void	Ref (void) const
void	Unref (void) const
Public Member Functions inherited from ns3::ObjectBase
virtual	~ObjectBase ()
void	GetAttribute (std::string name, AttributeValue &value) const
bool	GetAttributeFailSafe (std::string name, AttributeValue &attribute) const
void	SetAttribute (std::string name, const AttributeValue &value)
bool	SetAttributeFailSafe (std::string name, const AttributeValue &value)
bool	TraceConnect (std::string name, std::string context, const CallbackBase &cb)
bool	TraceConnectWithoutContext (std::string name, const CallbackBase &cb)
bool	TraceDisconnect (std::string name, std::string context, const CallbackBase &cb)
bool	TraceDisconnectWithoutContext (std::string name, const CallbackBase &cb)

Static Public Member Functions
static TypeId	GetTypeId (void)

Protected Member Functions
RngStream *	Peek (void) const
	Returns a pointer to the underlying RNG stream.
Protected Member Functions inherited from ns3::Object
	Object (const Object &o)
virtual void	DoDispose (void)
virtual void	DoInitialize (void)
virtual void	NotifyNewAggregate (void)

Private Member Functions
	RandomVariableStream (const RandomVariableStream &o)
RandomVariableStream &	operator= (const RandomVariableStream &o)

Private Attributes
bool	m_isAntithetic
	Indicates if antithetic values should be generated by this RNG stream.
RngStream *	m_rng
	Pointer to the underlying RNG stream.
int64_t	m_stream
	The stream number for this RNG stream.

Detailed Description

The Random Number Generator (RNG) that allows stream numbers to be set deterministically.

Note: The underlying random number generation method used by NS-3 is the RngStream code by Pierre L'Ecuyer at the University of Montreal.

NS-3 has a rich set of random number generators that allow stream numbers to be set deterministically if desired. Class RandomVariableStream defines the base class functionalty required for all such random number generators.

By default, the underlying generator is seeded all the time with the same seed value and run number coming from the ns3::GlobalValue RngSeed and RngRun. Also by default, the stream number value for this RNG stream is automatically allocated.

Config Paths

ns3::RandomVariableStream is accessible through the following paths with Config::Set and Config::Connect:

• /ChannelList/[i]/$ns3::WifiChannel/$ns3::YansWifiChannel/PropagationDelayModel/$ns3::RandomPropagationDelayModel/Variable
• /ChannelList/[i]/$ns3::WifiChannel/$ns3::YansWifiChannel/PropagationLossModel/$ns3::RandomPropagationLossModel/Variable
• /ChannelList/[i]/$ns3::YansWifiChannel/PropagationDelayModel/$ns3::RandomPropagationDelayModel/Variable
• /ChannelList/[i]/$ns3::YansWifiChannel/PropagationLossModel/$ns3::RandomPropagationLossModel/Variable
• /NodeList/[i]/$ns3::MobilityModel/$ns3::GaussMarkovMobilityModel/MeanDirection
• /NodeList/[i]/$ns3::MobilityModel/$ns3::GaussMarkovMobilityModel/MeanPitch
• /NodeList/[i]/$ns3::MobilityModel/$ns3::GaussMarkovMobilityModel/MeanVelocity
• /NodeList/[i]/$ns3::MobilityModel/$ns3::RandomDirection2dMobilityModel/Pause
• /NodeList/[i]/$ns3::MobilityModel/$ns3::RandomDirection2dMobilityModel/Speed
• /NodeList/[i]/$ns3::MobilityModel/$ns3::RandomWalk2dMobilityModel/Direction
• /NodeList/[i]/$ns3::MobilityModel/$ns3::RandomWalk2dMobilityModel/Speed
• /NodeList/[i]/$ns3::MobilityModel/$ns3::RandomWaypointMobilityModel/Pause
• /NodeList/[i]/$ns3::MobilityModel/$ns3::RandomWaypointMobilityModel/PositionAllocator/$ns3::RandomBoxPositionAllocator/X
• /NodeList/[i]/$ns3::MobilityModel/$ns3::RandomWaypointMobilityModel/PositionAllocator/$ns3::RandomBoxPositionAllocator/Y
• /NodeList/[i]/$ns3::MobilityModel/$ns3::RandomWaypointMobilityModel/PositionAllocator/$ns3::RandomBoxPositionAllocator/Z
• /NodeList/[i]/$ns3::MobilityModel/$ns3::RandomWaypointMobilityModel/PositionAllocator/$ns3::RandomDiscPositionAllocator/Rho
• /NodeList/[i]/$ns3::MobilityModel/$ns3::RandomWaypointMobilityModel/PositionAllocator/$ns3::RandomDiscPositionAllocator/Theta
• /NodeList/[i]/$ns3::MobilityModel/$ns3::RandomWaypointMobilityModel/PositionAllocator/$ns3::RandomRectanglePositionAllocator/X
• /NodeList/[i]/$ns3::MobilityModel/$ns3::RandomWaypointMobilityModel/PositionAllocator/$ns3::RandomRectanglePositionAllocator/Y
• /NodeList/[i]/$ns3::MobilityModel/$ns3::RandomWaypointMobilityModel/Speed
• /NodeList/[i]/ApplicationList/[i]/$ns3::OnOffApplication/OffTime
• /NodeList/[i]/ApplicationList/[i]/$ns3::OnOffApplication/OnTime
• /NodeList/[i]/DeviceList/[i]/$ns3::CsmaNetDevice/ReceiveErrorModel/$ns3::BurstErrorModel/BurstSize
• /NodeList/[i]/DeviceList/[i]/$ns3::CsmaNetDevice/ReceiveErrorModel/$ns3::BurstErrorModel/BurstStart
• /NodeList/[i]/DeviceList/[i]/$ns3::CsmaNetDevice/ReceiveErrorModel/$ns3::RateErrorModel/RanVar
• /NodeList/[i]/DeviceList/[i]/$ns3::PointToPointNetDevice/ReceiveErrorModel/$ns3::BurstErrorModel/BurstSize
• /NodeList/[i]/DeviceList/[i]/$ns3::PointToPointNetDevice/ReceiveErrorModel/$ns3::BurstErrorModel/BurstStart
• /NodeList/[i]/DeviceList/[i]/$ns3::PointToPointNetDevice/ReceiveErrorModel/$ns3::RateErrorModel/RanVar
• /NodeList/[i]/DeviceList/[i]/$ns3::SimpleNetDevice/ReceiveErrorModel/$ns3::BurstErrorModel/BurstSize
• /NodeList/[i]/DeviceList/[i]/$ns3::SimpleNetDevice/ReceiveErrorModel/$ns3::BurstErrorModel/BurstStart
• /NodeList/[i]/DeviceList/[i]/$ns3::SimpleNetDevice/ReceiveErrorModel/$ns3::RateErrorModel/RanVar
• /NodeList/[i]/DeviceList/[i]/$ns3::WifiNetDevice/Channel/$ns3::YansWifiChannel/PropagationDelayModel/$ns3::RandomPropagationDelayModel/Variable
• /NodeList/[i]/DeviceList/[i]/$ns3::WifiNetDevice/Channel/$ns3::YansWifiChannel/PropagationLossModel/$ns3::RandomPropagationLossModel/Variable

Attributes

• Stream: The stream number for this RNG stream. -1 means "allocate a stream automatically". Note that if -1 is set, Get will return -1 so that it is not possible to know which value was automatically allocated.
  • Set with class: ns3::IntegerValue
  • Underlying type: int64_t -9223372036854775808:9223372036854775807
  • Initial value: -1
  • Flags: construct write read
• Antithetic: Set this RNG stream to generate antithetic values
  • Set with class: BooleanValue
  • Underlying type: bool
  • Initial value: false
  • Flags: construct write read

No TraceSources are defined for this type.

Definition at line 57 of file random-variable-stream.h.

Constructor & Destructor Documentation

ns3::RandomVariableStream::RandomVariableStream

(

)

Definition at line 67 of file random-variable-stream.cc.

References NS_LOG_FUNCTION.

ns3::RandomVariableStream::~RandomVariableStream ( )

virtual

Definition at line 72 of file random-variable-stream.cc.

References m_rng, and NS_LOG_FUNCTION.

ns3::RandomVariableStream::RandomVariableStream ( const RandomVariableStream &  o )

private

Member Function Documentation

virtual uint32_t ns3::RandomVariableStream::GetInteger ( void  )

pure virtual

Returns a random integer integer from the underlying distribution.

Returns

Integer cast of RandomVariableStream::GetValue

Implemented in ns3::EmpiricalRandomVariable, ns3::DeterministicRandomVariable, ns3::ZetaRandomVariable, ns3::ZipfRandomVariable, ns3::TriangularRandomVariable, ns3::ErlangRandomVariable, ns3::GammaRandomVariable, ns3::LogNormalRandomVariable, ns3::NormalRandomVariable, ns3::WeibullRandomVariable, ns3::ParetoRandomVariable, ns3::ExponentialRandomVariable, ns3::SequentialRandomVariable, ns3::ConstantRandomVariable, and ns3::UniformRandomVariable.

Referenced by ns3::BurstErrorModel::DoCorrupt().

Here is the caller graph for this function:

int64_t ns3::RandomVariableStream::GetStream

(

void

)

const

Returns the stream number for this RNG stream.

Returns

The stream number for this RNG stream. -1 means "allocate a stream number automatically".

Definition at line 120 of file random-variable-stream.cc.

References m_stream, and NS_LOG_FUNCTION.

Referenced by GetTypeId().

Here is the caller graph for this function:

TypeId ns3::RandomVariableStream::GetTypeId ( void  )

static

Reimplemented from ns3::Object.

Reimplemented in ns3::EmpiricalRandomVariable, ns3::DeterministicRandomVariable, ns3::ZetaRandomVariable, ns3::ZipfRandomVariable, ns3::TriangularRandomVariable, ns3::ErlangRandomVariable, ns3::GammaRandomVariable, ns3::LogNormalRandomVariable, ns3::NormalRandomVariable, ns3::WeibullRandomVariable, ns3::ParetoRandomVariable, ns3::ExponentialRandomVariable, ns3::SequentialRandomVariable, ns3::ConstantRandomVariable, and ns3::UniformRandomVariable.

Definition at line 46 of file random-variable-stream.cc.

References GetStream(), IsAntithetic(), SetAntithetic(), ns3::TypeId::SetParent(), and SetStream().

Here is the call graph for this function:

virtual double ns3::RandomVariableStream::GetValue ( void  )

pure virtual

Returns a random double from the underlying distribution.

Returns

A floating point random value.

Implemented in ns3::EmpiricalRandomVariable, ns3::DeterministicRandomVariable, ns3::ZetaRandomVariable, ns3::ZipfRandomVariable, ns3::TriangularRandomVariable, ns3::ErlangRandomVariable, ns3::GammaRandomVariable, ns3::LogNormalRandomVariable, ns3::NormalRandomVariable, ns3::WeibullRandomVariable, ns3::ParetoRandomVariable, ns3::ExponentialRandomVariable, ns3::SequentialRandomVariable, ns3::ConstantRandomVariable, and ns3::UniformRandomVariable.

Referenced by ns3::RandomDirection2dMobilityModel::BeginPause(), ns3::RandomWaypointMobilityModel::BeginWalk(), ns3::RandomPropagationLossModel::DoCalcRxPower(), ns3::BurstErrorModel::DoCorrupt(), ns3::RateErrorModel::DoCorruptBit(), ns3::RateErrorModel::DoCorruptByte(), ns3::RateErrorModel::DoCorruptPkt(), ns3::RandomWalk2dMobilityModel::DoInitializePrivate(), ns3::RandomWaypointMobilityModel::DoInitializePrivate(), ns3::RandomPropagationDelayModel::GetDelay(), ns3::RandomRectanglePositionAllocator::GetNext(), ns3::RandomBoxPositionAllocator::GetNext(), ns3::RandomDiscPositionAllocator::GetNext(), ns3::SequentialRandomVariable::GetValue(), Histogramm(), ns3::OnOffApplication::ScheduleStartEvent(), ns3::OnOffApplication::ScheduleStopEvent(), ns3::RandomDirection2dMobilityModel::SetDirectionAndSpeed(), and ns3::GaussMarkovMobilityModel::Start().

Here is the caller graph for this function:

bool ns3::RandomVariableStream::IsAntithetic

(

void

)

const

Returns true if antithetic values should be generated.

Returns

A bool value that indicates if antithetic values should be generated by this RNG stream.

Definition at line 85 of file random-variable-stream.cc.

References m_isAntithetic, and NS_LOG_FUNCTION.

Referenced by ns3::ErlangRandomVariable::GetExponentialValue(), ns3::GammaRandomVariable::GetNormalValue(), GetTypeId(), ns3::UniformRandomVariable::GetValue(), ns3::ExponentialRandomVariable::GetValue(), ns3::ParetoRandomVariable::GetValue(), ns3::WeibullRandomVariable::GetValue(), ns3::NormalRandomVariable::GetValue(), ns3::LogNormalRandomVariable::GetValue(), ns3::GammaRandomVariable::GetValue(), ns3::TriangularRandomVariable::GetValue(), ns3::ZipfRandomVariable::GetValue(), ns3::ZetaRandomVariable::GetValue(), and ns3::EmpiricalRandomVariable::GetValue().

Here is the caller graph for this function:

RandomVariableStream& ns3::RandomVariableStream::operator= ( const RandomVariableStream &  o )

private

RngStream * ns3::RandomVariableStream::Peek ( void  ) const

protected

Returns a pointer to the underlying RNG stream.

Definition at line 127 of file random-variable-stream.cc.

References m_rng, and NS_LOG_FUNCTION.

Referenced by ns3::ErlangRandomVariable::GetExponentialValue(), ns3::GammaRandomVariable::GetNormalValue(), ns3::UniformRandomVariable::GetValue(), ns3::ExponentialRandomVariable::GetValue(), ns3::ParetoRandomVariable::GetValue(), ns3::WeibullRandomVariable::GetValue(), ns3::NormalRandomVariable::GetValue(), ns3::LogNormalRandomVariable::GetValue(), ns3::GammaRandomVariable::GetValue(), ns3::TriangularRandomVariable::GetValue(), ns3::ZipfRandomVariable::GetValue(), ns3::ZetaRandomVariable::GetValue(), and ns3::EmpiricalRandomVariable::GetValue().

Here is the caller graph for this function:

void ns3::RandomVariableStream::SetAntithetic

(

bool

isAntithetic

)

Specifies whether antithetic values should be generated.

Parameters

isAntithetic

Set equal to true if antithetic values should be generated by this RNG stream.

Definition at line 79 of file random-variable-stream.cc.

References m_isAntithetic, and NS_LOG_FUNCTION.

Referenced by GetTypeId().

Here is the caller graph for this function:

void ns3::RandomVariableStream::SetStream

(

int64_t

stream

)

Specifies the stream number for this RNG stream.

Parameters

stream

The stream number for this RNG stream. -1 means "allocate a stream number automatically".

Definition at line 91 of file random-variable-stream.cc.

References ns3::RngSeedManager::GetNextStreamIndex(), ns3::RngSeedManager::GetRun(), ns3::RngSeedManager::GetSeed(), m_rng, m_stream, NS_ASSERT, and NS_LOG_FUNCTION.

Referenced by ns3::RandomBuildingPositionAllocator::AssignStreams(), ns3::RandomVariableStreamHelper::AssignStreams(), ns3::RealRandomStream::AssignStreams(), ns3::BriteTopologyHelper::AssignStreams(), ns3::Radvd::AssignStreams(), ns3::LteUeMac::AssignStreams(), ns3::RandomRoomPositionAllocator::AssignStreams(), ns3::dot11s::HwmpProtocol::AssignStreams(), ns3::dsdv::RoutingProtocol::AssignStreams(), ns3::Backoff::AssignStreams(), ns3::UanMacCw::AssignStreams(), ns3::aodv::RoutingProtocol::AssignStreams(), ns3::MinstrelWifiManager::AssignStreams(), ns3::olsr::RoutingProtocol::AssignStreams(), ns3::OnOffApplication::AssignStreams(), ns3::Ipv6Extension::AssignStreams(), ns3::SameRoomPositionAllocator::AssignStreams(), ns3::MeshWifiInterfaceMac::AssignStreams(), ns3::YansWifiPhy::AssignStreams(), ns3::dot11s::PeerManagementProtocol::AssignStreams(), ns3::UanMacRc::AssignStreams(), ns3::RedQueue::AssignStreams(), ns3::SimpleOfdmWimaxPhy::AssignStreams(), ns3::RandomRectanglePositionAllocator::AssignStreams(), ns3::RandomBoxPositionAllocator::AssignStreams(), ns3::UanPhyGen::AssignStreams(), ns3::RateErrorModel::AssignStreams(), ns3::Ipv4GlobalRouting::AssignStreams(), ns3::RandomDiscPositionAllocator::AssignStreams(), ns3::UniformDiscPositionAllocator::AssignStreams(), ns3::BurstErrorModel::AssignStreams(), ns3::LteSpectrumPhy::AssignStreams(), ns3::AnimationInterface::AssignStreams(), ns3::dsr::DsrRouting::AssignStreams(), ns3::JakesPropagationLossModel::DoAssignStreams(), ns3::RandomDirection2dMobilityModel::DoAssignStreams(), ns3::RandomWaypointMobilityModel::DoAssignStreams(), ns3::RandomWalk2dMobilityModel::DoAssignStreams(), ns3::SteadyStateRandomWaypointMobilityModel::DoAssignStreams(), ns3::RandomPropagationDelayModel::DoAssignStreams(), ns3::GaussMarkovMobilityModel::DoAssignStreams(), ns3::BuildingsPropagationLossModel::DoAssignStreams(), ns3::RandomPropagationLossModel::DoAssignStreams(), ns3::NakagamiPropagationLossModel::DoAssignStreams(), ns3::LteX2HandoverTestCase::DoRun(), ErrorModelSimple::DoRun(), BurstErrorModelSimple::DoRun(), and GetTypeId().

Here is the call graph for this function:

Here is the caller graph for this function:

Member Data Documentation

bool ns3::RandomVariableStream::m_isAntithetic

private

Indicates if antithetic values should be generated by this RNG stream.

Definition at line 119 of file random-variable-stream.h.

Referenced by IsAntithetic(), and SetAntithetic().

RngStream* ns3::RandomVariableStream::m_rng

private

Pointer to the underlying RNG stream.

Definition at line 116 of file random-variable-stream.h.

Referenced by Peek(), SetStream(), and ~RandomVariableStream().

int64_t ns3::RandomVariableStream::m_stream

private

The stream number for this RNG stream.

Definition at line 122 of file random-variable-stream.h.

Referenced by GetStream(), and SetStream().

---

The documentation for this class was generated from the following files:

• src/core/model/random-variable-stream.h
• src/core/model/random-variable-stream.cc