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#include "DQM/SiStripCommon/interface/UpdateTProfile.h"
#include "TProfile.h"
#include <iostream>
#include <cmath>
// -----------------------------------------------------------------------------
/** */
UpdateTProfile::UpdateTProfile() { ; }
// -----------------------------------------------------------------------------
/** */
UpdateTProfile::~UpdateTProfile() { ; }
// -----------------------------------------------------------------------------
/** */
void UpdateTProfile::setBinContents(TProfile* const prof,
const uint32_t& bin,
const double& num_of_entries,
const double& sum_of_contents,
const double& sum_of_squares) {
// std::cout << "[UpdateTProfile::setBinContents]" << std::endl;
double mean = 0.;
double spread = 0.;
if (num_of_entries) {
mean = sum_of_contents / num_of_entries;
spread = sqrt(sum_of_squares / num_of_entries - mean * mean);
}
// LogTrace("TEST")
// << "[UpdateTProfile::setBinContents]"
// << " bin: " << bin
// << " entries: " << num_of_entries
// << " contents: " << sum_of_contents
// << " squared: " << sum_of_squares
// << " mean: " << mean
// << " spread: " << spread;
UpdateTProfile::setBinContent(prof, bin, num_of_entries, mean, spread);
}
// -----------------------------------------------------------------------------
/**
Error option "s" means that the error returned using the
GetBinError() method is the spread for that bin. (If the default
error option is used, the error returned is spread / sqrt(N),
where N is the number of entries for that bin). The commissioning
procedures use option "s" throughout.
In order that the profile histo correctly displays the "bin_mean"
and "bin_spread" (an example being: peds +/- strip noise), we
have to manipulate the "contents" and "error" data as follows:
TProfile::SetBinEntries( bin_number, bin_entries )
TProfile::SetBinContents( bin_number, bin_mean * bin_entries )
TProfile::SetBinError( bin_number, weight )
"weight" is calculated based on the GetBinError() method, which
returns an error ("err" below) based on the following equation:
1) if error option is set to "s":
err = sqrt( wei^2 / num - ( sum / num )^2 )
=> err = sqrt( wei^2 / num - sum^2 / num^2 )
=> wei = sqrt( err^2 * num + sum^2 / num )
=> wei = sqrt( err^2 * num + mean^2 * num )
2) else if error option is set to "" (ie, default):
err = ( 1 / sqrt( num ) ) * sqrt( wei^2 / num - ( sum / num )^2 )
=> err = sqrt( wei^2 / num^2 - sum^2 / num^3 )
=> wei = sqrt( err^2 * num^2 + cont^2 / num )
=> wei = sqrt( err^2 * num^2 + mean^2 * num )
where:
"num" is the bin entries, as set by the method SetBinEntries()
"sum" is the bin content, as set by the method SetBinContent()
"wei" is the bin error, as set by the method SetBinError()
and "mean" = sum / num
*/
void UpdateTProfile::setBinContent(
TProfile* const prof, const uint32_t& bin, const double& num_of_entries, const double& mean, const double& spread) {
// std::cout << "[UpdateTProfile::setBinContents]" << std::endl;
// Check histo exists
if (!prof) {
std::cerr << "[UpdateTProfile::setBinContents]"
<< " NULL pointer to TProfile object!" << std::endl;
return;
}
// Check bin number is valid
if (bin == 0 || bin > static_cast<uint32_t>(prof->GetNbinsX())) {
std::cerr << "[UpdateTProfile::setBinContents]"
<< " Unexpected bin number!" << std::endl;
return;
}
// Check entries are present
if (num_of_entries <= 0.) {
return;
} //@@ what about negative weights???
double entries = num_of_entries;
// Check error option
const char* spread_option = "s";
const char* default_option = "";
// const char* option = prof->GetErrorOption();
// if ( option[0] != spread_option[0] ) {
// std::cout << "[UpdateTProfile::setBinContents]"
// << " Setting error option for TProfile to 's'!" << std::endl;
// prof->SetErrorOption( "s" );
// }
const char* error_option = prof->GetErrorOption();
// Calculate "weight" used for SetBinError() method
double weight;
if (error_option[0] == spread_option[0]) {
weight = sqrt(mean * mean * entries + spread * spread * entries);
} else if (error_option[0] == default_option[0]) {
weight = sqrt(mean * mean * entries + spread * spread * entries * entries);
} else {
std::cerr << "[UpdateTProfile::setBinContents]"
<< " Unexpected error option for TProfile!" << std::endl;
weight = 0.;
}
// Set bin entries, contents and error
prof->SetBinEntries(bin, entries);
prof->SetBinContent(bin, mean * entries);
prof->SetBinError(bin, weight);
// LogTrace("TEST")
// << "[UpdateTProfile::" << __func__ << "]"
// << " bin/entries/mean/content/error: "
// << bin << "/"
// << entries << "/"
// << mean << "/"
// << mean*entries << "/"
// << weight;
// Set total number of entries
if (bin == 1) {
prof->SetEntries(entries);
} else {
prof->SetEntries(prof->GetEntries() + entries);
}
}
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