Int_t foam_demopers()
{
gSystem->Load("libFoam");
// need to load the foam_demo tutorial for the definition of the function
TString macroName = gSystem->UnixPathName(__FILE__);
macroName.ReplaceAll("foam_demopers.C","foam_demo.C");
gROOT->ProcessLine(TString::Format(".L %s+",macroName.Data()));
//******************************************
cout<<"====================== TestVector ================================"<<endl;
TFile fileA("foam_demo.root");
fileA.cd();
cout<<"------------------------------------------------------------------"<<endl;
fileA.ls();
cout<<"------------------------------------------------------------------"<<endl;
fileA.Map();
cout<<"------------------------------------------------------------------"<<endl;
fileA.ShowStreamerInfo();
cout<<"------------------------------------------------------------------"<<endl;
fileA.GetListOfKeys()->Print();
cout<<"------------------------------------------------------------------"<<endl;
//*******************************************
TFoam *FoamX = (TFoam*)fileA.Get("FoamX");
//*******************************************
// FoamX->PrintCells();
FoamX->CheckAll(1);
//N.B. the integrand functions need to be reset
// because cannot be made persistent
#ifdef __CINT__
// this can be done only in CINT
TFoamIntegrand *rho= new TFDISTR();
#else
// this should be done with AClic or Cling
TFoamIntegrand * rho = (TFoamIntegrand*) gROOT->ProcessLine("return new TFDISTR();");
#endif
FoamX->SetRho(rho);
Double_t *MCvect =new Double_t[2]; // 2-dim vector generated in the MC run
for(long loop=0; loop<50000; loop++){
FoamX->MakeEvent(); // generate MC event
FoamX->GetMCvect( MCvect); // get generated vector (x,y)
Double_t x=MCvect[0];
Double_t y=MCvect[1];
if(loop<10) cout<<"(x,y) = ( "<< x <<", "<< y <<" )"<<endl;
}// loop
//
Double_t IntNorm, Errel;
FoamX->Finalize( IntNorm, Errel); // final printout
Double_t MCresult, MCerror;
FoamX->GetIntegMC( MCresult, MCerror); // get MC integral, should be one
cout << " MCresult= " << MCresult << " +- " << MCerror <<endl;
cout<<"===================== TestPers FINISHED ======================="<<endl;
return 0;
}
Int_t foam_kanwa(){
cout<<"--- kanwa started ---"<<endl;
TH2D *hst_xy = new TH2D("hst_xy" , "x-y plot", 50,0,1.0, 50,0,1.0);
Double_t *MCvect =new Double_t[2]; // 2-dim vector generated in the MC run
//
TRandom *PseRan = new TRandom3(); // Create random number generator
PseRan->SetSeed(4357);
TFoam *FoamX = new TFoam("FoamX"); // Create Simulator
FoamX->SetkDim(2); // No. of dimensions, obligatory!
FoamX->SetnCells(500); // Optionally No. of cells, default=2000
FoamX->SetRhoInt(Camel2); // Set 2-dim distribution, included below
FoamX->SetPseRan(PseRan); // Set random number generator
FoamX->Initialize(); // Initialize simulator, may take time...
//
// visualising generated distribution
TCanvas *cKanwa = new TCanvas("cKanwa","Canvas for plotting",600,600);
cKanwa->cd();
// From now on FoamX is ready to generate events
int nshow=5000;
for(long loop=0; loop<100000; loop++){
FoamX->MakeEvent(); // generate MC event
FoamX->GetMCvect( MCvect); // get generated vector (x,y)
Double_t x=MCvect[0];
Double_t y=MCvect[1];
if(loop<10) cout<<"(x,y) = ( "<< x <<", "<< y <<" )"<<endl;
hst_xy->Fill(x,y);
// live plot
if(loop == nshow){
nshow += 5000;
hst_xy->Draw("lego2");
cKanwa->Update();
}
}// loop
//
hst_xy->Draw("lego2"); // final plot
cKanwa->Update();
//
Double_t MCresult, MCerror;
FoamX->GetIntegMC( MCresult, MCerror); // get MC integral, should be one
cout << " MCresult= " << MCresult << " +- " << MCerror <<endl;
cout<<"--- kanwa ended ---"<<endl;
return 0;
}//kanwa
void Foam::Init()
{
//Retrieve the maxima and minima, to use in the coordinate transforms
for (unsigned int continuousIndex = 0; continuousIndex < continuousNames.size(); ++continuousIndex )
{
double maximum = generationBoundary->GetConstraint( *continuousNames_ref[continuousIndex] )->GetMaximum();
double minimum = generationBoundary->GetConstraint( *continuousNames_ref[continuousIndex] )->GetMinimum();
minima.push_back(minimum);
ranges.push_back( maximum - minimum );
}
double rand = rootRandom->Rndm();
//Make a Foam generator for each combination
for( unsigned int combinationIndex = 0; combinationIndex < discreteCombinations.size(); ++combinationIndex )
{
//Make the data point for the combination
DataPoint * init_temporaryDataPoint = new DataPoint(allNames);
for( unsigned int discreteIndex = 0; discreteIndex < discreteNames.size(); ++discreteIndex )
{
IConstraint* thisConst=NULL;
try
{
thisConst=generationBoundary->GetConstraint( *discreteNames_ref[discreteIndex] );
}
catch(...)
{
cout << endl;
exit(52);
}
string unit = thisConst->GetUnit();
init_temporaryDataPoint->SetObservable( discreteNames[discreteIndex], discreteCombinations[combinationIndex][discreteIndex], unit );
}
for (unsigned int continuousIndex = 0; continuousIndex < continuousNames.size(); ++continuousIndex )
{
IConstraint* thisConst=NULL;
try
{
thisConst=generationBoundary->GetConstraint( *continuousNames_ref[continuousIndex] );
}
catch(...)
{
cout << endl;
exit(53);
}
string unit = thisConst->GetUnit();
init_temporaryDataPoint->SetObservable( continuousNames[continuousIndex], 0.0, unit );
}
//init_temporaryDataPoint->Print();
//Make the function wrapper
IntegratorFunction* combinationFunction = new IntegratorFunction( InputPDF, init_temporaryDataPoint, continuousNames, discreteNames, minima, ranges, generationBoundary );
//cout << InputPDF->GET_ID() << endl;
//if( InputPDF->GetCacheStatus() ) cout << "HAS CACHED FOAM" << endl;
//else cout << "HAS NOT CACHED FOAM" << endl;
TFile* MC_Cache = NULL;
TFoam * foamGenerator = NULL;
if( !InputPDF->GetMCCacheStatus() )
{
// Generate unique name for this foam instance
TString Name("Foam-");
Name.Append(InputPDF->GetLabel());
Name.Append("-");
Name+=combinationIndex;
Name.Append("_");Name+=rand;
string CleanName=Name.Data(); replace( CleanName.begin(), CleanName.end(), '.', '_' ); Name=CleanName.c_str();
TString FoamName("Foam_");FoamName+=combinationIndex;
// Create a root file to store the TFoam universe
TString RootName(Name);
RootName.Append(".root");
cout << "FOAM NOT Cached, Generating Foam:\t" << Name << endl;
MC_Cache = new TFile( RootName, "RECREATE" );
MC_Cache->Write( "", TObject::kOverwrite );
/*
if( debug != NULL )
{
if( debug->DebugThisClass("Foam") )
{
cout << "File Created" << endl;
}
}
*/
//Initialise Foam
foamGenerator = new TFoam( Name );
foamGenerator->SetkDim( Int_t(continuousNames.size()) );
foamGenerator->SetPseRan( rootRandom );
foamGenerator->SetRho( combinationFunction ); // Can afford to Boot Foam's ability if we're using just one cached instance :D
foamGenerator->SetnCells( 1000 ); // 1000 Total number of bins to construct
foamGenerator->SetnSampl( 200 ); // 200 Samples to take when constructing bins
foamGenerator->SetnBin( 8 ); // 8 Bins along each axis
foamGenerator->SetOptRej( 1 ); // 1/0 Don't/Use Weighted Distribution
foamGenerator->SetOptDrive( 2 ); // 1/2 Best Varience/Weights
foamGenerator->SetEvPerBin( 25 ); // 25 Weights per bin... This doesn't Saturate as object is written before generating events
foamGenerator->SetChat( 0 ); // 0 verbosity
foamGenerator->SetMaxWtRej( 1.1 ); // 1.1 Unknown what effect this has, something to do with weights
/*
if( debug != NULL )
{
if( debug->DebugThisClass("Foam") )
{
cout << "Initializing Foam" << endl;
}
}
*/
foamGenerator->Initialize();
// foamGenerator->ResetPseRan( rootRandom );
// foamGenerator->ResetRho( combinationFunction ); // Can afford to Boot Foam's ability if we're using just one cached instance :D
// foamGenerator->Initialize();
// As we haven't cached yet, write to file
foamGenerator->Write( Name, TObject::kOverwrite );
cout << "Storing TFOAM TObject in:\t\t" << RootName << endl;
/*
if( debug != NULL )
{
if( debug->DebugThisClass("Foam") )
{
cout << "Adding Cache" << endl;
}
}
*/
InputPDF->AddCacheObject( Name.Data() );
MC_Cache->Write( "", TObject::kOverwrite );
InputPDF->Can_Remove_Cache( true );
//MC_Cache->Close();
}
else
{
TString Name = InputPDF->GetMCCacheNames()[combinationIndex];
TString RootName(Name); RootName.Append(".root");
TString FoamName("Foam_");FoamName+=combinationIndex;
rootRandom = RapidFitRandom::GetRandomFunction();
cout << "FOAM Cached, Re-Aquiring TFOAM TObject:\t" << Name << endl;
ifstream input_file;
input_file.open( RootName.Data(), ifstream::in );
input_file.close();
bool access_fail = input_file.fail();
if( access_fail )
{
cout << "\nWe have Failed to re-aquire the TFoam File, Regenerating one for the Fit\n" << endl;
InputPDF->Remove_Cache();
// Generate unique name for this foam instance
Name="Foam-";
Name.Append(InputPDF->GetLabel());
Name.Append("-");
Name+=combinationIndex;
Name.Append("_");Name+=rand;
string CleanName=Name.Data(); replace( CleanName.begin(), CleanName.end(), '.', '_' ); Name=CleanName.c_str();
FoamName="Foam_";FoamName+=combinationIndex;
// Create a root file to store the TFoam universe
RootName=Name;
RootName.Append(".root");
cout << "FOAM NOT Cached, Generating Foam:\t" << Name << endl;
MC_Cache = new TFile( RootName, "RECREATE" );
MC_Cache->Write( "", TObject::kOverwrite );
//Initialise Foam
foamGenerator = new TFoam( Name );
foamGenerator->SetkDim( Int_t(continuousNames.size()) );
foamGenerator->SetPseRan( rootRandom );
foamGenerator->SetRho( combinationFunction ); // Can afford to Boot Foam's ability if we're using just one cached instance :D
foamGenerator->SetnCells( 1000 ); // 1000 Total number of bins to construct
foamGenerator->SetnSampl( 200 ); // 200 Samples to take when constructing bins
foamGenerator->SetnBin( 8 ); // 8 Bins along each axis
foamGenerator->SetOptRej( 1 ); // 1/0 Don't/Use Weighted Distribution
foamGenerator->SetOptDrive( 2 ); // 1/2 Best Varience/Weights
foamGenerator->SetEvPerBin( 25 ); // 25 Weights per bin... This doesn't Saturate as object is written before generating events
foamGenerator->SetChat( 0 ); // 0 verbosity
foamGenerator->SetMaxWtRej( 1.1 ); // 1.1 Unknown what effect this has, something to do with weights
foamGenerator->Initialize();
// foamGenerator->ResetPseRan( rootRandom );
// foamGenerator->ResetRho( combinationFunction ); // Can afford to Boot Foam's ability if we're using just one cached instance :D
// foamGenerator->Initialize();
// As we haven't cached yet, write to file
//MC_Cache->Write( "", TObject::kOverwrite );
foamGenerator->Write( Name, TObject::kOverwrite );
cout << "Storing TFOAM TObject in:\t\t" << RootName << endl;
InputPDF->AddCacheObject( Name.Data() );
MC_Cache->Write( "", TObject::kOverwrite );
InputPDF->Can_Remove_Cache( true );
}
else
{
MC_Cache = new TFile( RootName, "READ" );
//gDirectory->ls();
//Cached_Files.back()->Map();
//Cached_Files.back()->ShowStreamerInfo();
//Cached_Files.back()->GetListOfKeys()->Print();
foamGenerator = (TFoam*) MC_Cache->Get( Name );
// This code has been production testeted enough such that I think this is pointlessly scaring users
//cout << "Checking Consistancy, will crash if this fails... this is unavoidable" << endl;
//cout << MC_Cache << endl;
//cout << foamGenerator << endl;
if( MC_Cache == NULL || foamGenerator == NULL )
{
cerr << "Error re-aquiring TFOAM object. This is unrecoverable" << endl;
cout << "Error re-aquiring TFOAM object. This is unrecoverable" << endl;
exit(-6542);
}
foamGenerator->ResetPseRan( rootRandom );
foamGenerator->ResetRho( combinationFunction );
foamGenerator->SetnCells( 1000 ); // 1000 Total number of bins to construct
foamGenerator->SetnSampl( 200 ); // 200 Samples to take when constructing bins
foamGenerator->SetnBin( 8 ); // 8 Bins along each axis
foamGenerator->SetOptRej( 1 ); // 1/0 Don't/Use Weighted Distribution
foamGenerator->SetOptDrive( 2 ); // 1/2 Best Varience/Weights
foamGenerator->SetEvPerBin( 25 ); // 25 Weights per bin... This doesn't Saturate as object is written before generating events
foamGenerator->SetChat( 0 ); // 0 verbosity
foamGenerator->SetMaxWtRej( 1.1 ); // 1.1 Unknown what effect this has, something to do with weights
foamGenerator->CheckAll(0);
// Make one event here to check everything was processed correctly
foamGenerator->MakeEvent();
cout << "Check OK" << endl;
}
}
Open_Files.push_back( MC_Cache );
//Debug
//char filename[100];
//sprintf( filename, "DebugFoamPlot.%d.c", combinationIndex );
//foamGenerator->RootPlot2dim(filename);
//foamGenerator->PrintCells();
//Store the foam generator
foamGenerators.push_back( foamGenerator );
storedIntegrator.push_back( combinationFunction );
delete init_temporaryDataPoint;
}
InputPDF->SetMCCacheStatus( true );
}
