[u/mrichter/AliRoot.git] / MONITOR / AliMonitorTrend.cxx

/**************************************************************************
 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
 *                                                                        *
 * Author: The ALICE Off-line Project.                                    *
 * Contributors are mentioned in the code where appropriate.              *
 *                                                                        *
 * Permission to use, copy, modify and distribute this software and its   *
 * documentation strictly for non-commercial purposes is hereby granted   *
 * without fee, provided that the above copyright notice appears in all   *
 * copies and that both the copyright notice and this permission notice   *
 * appear in the supporting documentation. The authors make no claims     *
 * about the suitability of this software for any purpose. It is          *
 * provided "as is" without express or implied warranty.                  *
 **************************************************************************/

/* $Id$ */

///////////////////////////////////////////////////////////////////////////////
//                                                                           //
//  This class maintains a plot for the evolution of a value that is used    //
//  tomonitor the quality of the recorded data.                              //
//  The trendgram is created and filled by a sub class of AliMonitor.        //
//  It can be compared to a reference trendgram. For the comparison a        //
//  maximal deviation (in standard deviations) can be specified.             //
//  The bins where the maximal deviation is exceeded are drawn in red.       //
//                                                                           //
///////////////////////////////////////////////////////////////////////////////


#include <TH1.h>
#include <TVirtualPad.h>
#include <TLine.h>

#include "AliLog.h"

#include "AliMonitorTrend.h"


ClassImp(AliMonitorTrend) 


Int_t AliMonitorTrend::fgIncSize = 10;


//_____________________________________________________________________________
AliMonitorTrend::AliMonitorTrend():
  AliMonitorPlot(),
  fLabel(),
  fMin(0),
  fMax(0),
  fData(),
  fHistoDraw(NULL),
  fRefMean(0),
  fRefSigma(-1),
  fHistoCompare(NULL)
{
// default contructor

}

//_____________________________________________________________________________
AliMonitorTrend::AliMonitorTrend(const AliMonitorTrend& trend) :
  AliMonitorPlot(trend),
  fLabel(trend.fLabel),
  fMin(trend.fMin),
  fMax(trend.fMax),
  fData(trend.fData),
  fHistoDraw(NULL),
  fRefMean(trend.fRefMean),
  fRefSigma(trend.fRefSigma),
  fHistoCompare(NULL)
{
// copy constructor

}

//_____________________________________________________________________________
AliMonitorTrend& AliMonitorTrend::operator =(const AliMonitorTrend& trend)
{
// assignment operator

  AliMonitorPlot::operator =(trend);

  fLabel = trend.fLabel;
  fMin = trend.fMin;
  fMax = trend.fMax;
  trend.fData.Copy(fData);

  fHistoDraw = NULL;
  fRefMean = trend.fRefMean;
  fRefSigma = trend.fRefSigma;
  fHistoCompare = NULL;

  return *this;
}

//_____________________________________________________________________________
AliMonitorTrend::AliMonitorTrend(const char* name, const char* title,
		  const char* label, Double_t min, Double_t max) :
  AliMonitorPlot(name, title),
  fLabel(label),
  fMin(min),
  fMax(max),
  fData(),
  fHistoDraw(NULL),
  fRefMean(0),
  fRefSigma(0),
  fHistoCompare(NULL)
{
// create a monitor trend

}

//_____________________________________________________________________________
AliMonitorTrend::~AliMonitorTrend()
{
// delete all histograms

  if (fHistoDraw) delete fHistoDraw;
  if (fHistoCompare) delete fHistoCompare;
}


//_____________________________________________________________________________
void AliMonitorTrend::SetReference(TH1* ref)
{
// set the reference trend for comparison

  Int_t n = ref->GetXaxis()->GetNbins();
  if (n <= 0) return;

  Double_t sum = 0;
  Double_t sum2 = 0;
  for (Int_t i = 1; i <= n; i++) {
    sum += ref->GetBinContent(i);
    sum2 += ref->GetBinContent(i) * ref->GetBinContent(i);
  }

  fRefMean = sum / n;
  fRefSigma = TMath::Sqrt(sum2 - sum*sum/n) / n;
}

//_____________________________________________________________________________
void AliMonitorTrend::SetReference(AliMonitorPlot* ref)
{
// set the reference trendgram for comparison

  if (!ref->InheritsFrom(AliMonitorTrend::Class())) return;
  fRefMean = ((AliMonitorTrend*)ref)->GetMean();
  fRefSigma = ((AliMonitorTrend*)ref)->GetSigma();
}


//_____________________________________________________________________________
void AliMonitorTrend::Fill(Double_t x)
{
// add a value to the monitor trend

  if (fNumberOfEvents >= fData.GetSize()) {
    fData.Set(fNumberOfEvents + fgIncSize);
  }
  fData[fNumberOfEvents] = x;
}


//_____________________________________________________________________________
void AliMonitorTrend::Update()
{
// update

  fNumberOfEvents++;
}

//_____________________________________________________________________________
void AliMonitorTrend::Add(AliMonitorPlot* plot)
{
// merge the given trend to this one

  if (!plot->InheritsFrom(AliMonitorTrend::Class())) return;
  AliMonitorTrend* trend = (AliMonitorTrend*) plot;

  Int_t numberOfEvents = fNumberOfEvents + trend->fNumberOfEvents;
  if (numberOfEvents >=  fData.GetSize()) {
    fData.Set(numberOfEvents + fgIncSize);
  }
  for (Int_t i = 0; i < trend->fNumberOfEvents; i++) {
    fData[fNumberOfEvents + i] = trend->fData[i];
  }
  fNumberOfEvents = numberOfEvents;
}

//_____________________________________________________________________________
void AliMonitorTrend::Reset()
{
// reset the monitor trend for a new run

  fData.Set(fgIncSize);
  if (fHistoDraw) delete fHistoDraw;
  fHistoDraw = NULL;
  if (fHistoCompare) delete fHistoCompare;
  fHistoCompare = NULL;
  fNumberOfEvents = 0;
}

//_____________________________________________________________________________
void AliMonitorTrend::ResetList()
{
// reset the the list of monitor histograms
// (not applicable for trend)

}


//_____________________________________________________________________________
Bool_t AliMonitorTrend::ComparePlot()
{
// compare the data trend to the reference
// if they deviate by more than fgThreshold standard deviations in a bin,
// this bin is set in fHistoCompare and kFALSE is returned
  
  if (fRefSigma < 0) return kTRUE;
  if (fgThreshold <= 0) return kTRUE;
  if (!fHistoDraw) {
    AliWarning("no data trend available for comparison\ncall DrawSum or DrawRaw before calling Compare");
    return kTRUE;
  }

  Int_t nBins = fHistoDraw->GetXaxis()->GetNbins();
  if (fHistoCompare) delete fHistoCompare;
  fHistoCompare = CreateHisto(nBins);
  fHistoCompare->Reset();
  fHistoCompare->SetOption("P");
  fHistoCompare->SetMarkerStyle(kFullCircle);
  fHistoCompare->SetFillStyle(0);
  Bool_t result = kTRUE;

  for (Int_t iBin = 1; iBin <= nBins; iBin++) {
    Double_t delta = TMath::Abs(fHistoDraw->GetBinContent(iBin) - fRefMean);
    if (delta > fgThreshold*fRefSigma) {
      fHistoCompare->SetBinContent(iBin, fHistoDraw->GetBinContent(iBin));
      result = kFALSE;
    }
  }

  return result;
}

//_____________________________________________________________________________
Bool_t AliMonitorTrend::GetEvent(Int_t)
{
// there is no single event trend

//  Info("GetEvent", "there is no trend for single events available");
  return kFALSE;
}

//_____________________________________________________________________________
Bool_t AliMonitorTrend::GetSum(Int_t number)
{
// get the monitor trend for the last  "number" events

  if (number > fNumberOfEvents) {
    AliError(Form("requested number of events (%d) exceeds range of available events (%d)\nusing last %d event(s)", 
	  number, fNumberOfEvents, fNumberOfEvents));
    number = fNumberOfEvents;
  }
  if (number <= 0) return kFALSE;

  if (fHistoDraw) delete fHistoDraw;
  if (fHistoCompare) delete fHistoCompare;
  fHistoCompare = NULL;

  fHistoDraw = CreateHisto(number);
  return kTRUE;
}

//_____________________________________________________________________________
Bool_t AliMonitorTrend::GetRun()
{
// get the monitor trend for all monitored events of the current run

  if (fHistoDraw) delete fHistoDraw;
  if (fHistoCompare) delete fHistoCompare;
  fHistoCompare = NULL;
  if (fNumberOfEvents <= 0) return kFALSE;

  fHistoDraw = CreateHisto(fNumberOfEvents);
  return kTRUE;
}

//_____________________________________________________________________________
void AliMonitorTrend::DrawPlot()
{
// draw the trendgrams

  fHistoDraw->SetMarkerColor(fgColorData);
  fHistoDraw->SetLineColor(fgColorData);
  fHistoDraw->SetLineWidth(2);
  fHistoDraw->DrawCopy();

  if ((fRefSigma > 0) && fgDrawRef) {
    if ((fRefMean+fRefSigma > fHistoDraw->GetMaximum()) && !(fMax > fMin)) {
      fHistoDraw->SetMaximum(fRefMean+fRefSigma * 1.1);
    }

    Double_t xMin = fHistoDraw->GetXaxis()->GetXmin();
    Double_t xMax = fHistoDraw->GetXaxis()->GetXmax();
    TLine* mean = new TLine(xMin, fRefMean, xMax, fRefMean);
    mean->SetLineColor(fgColorRef);
    mean->SetLineWidth(2);
    mean->Draw();
    TLine* high = new TLine(xMin, fRefMean+fRefSigma, 
			    xMax, fRefMean+fRefSigma);
    high->SetLineColor(fgColorRef);
    high->SetLineWidth(2);
    high->SetLineStyle(2);
    high->Draw();
    TLine* low = new TLine(xMin, fRefMean-fRefSigma, 
			   xMax, fRefMean-fRefSigma);
    low->SetLineColor(fgColorRef);
    low->SetLineWidth(2);
    low->SetLineStyle(2);
    low->Draw();

//    char option[256];
//    sprintf(option, "%sSAME", fHistoDraw->GetOption());
//    fHistoDraw->DrawCopy(option);

    if (fHistoCompare && (fgThreshold > 0)) {
      char option[256];
      sprintf(option, "%sSAME", fHistoCompare->GetOption());
      fHistoCompare->SetMarkerColor(fgColorCompare);
      fHistoCompare->SetLineColor(fgColorCompare);
      fHistoCompare->SetLineWidth(2);
      fHistoCompare->DrawCopy(option);
    }
  }

  gPad->Update();
}


//_____________________________________________________________________________
TH1* AliMonitorTrend::CreateHisto(Int_t nBins)
{
// create a histogram for a trend plot with the last nBin entries

  TH1* result = new TH1D(GetName(), GetTitle(), nBins, -nBins-0.5, -0.5);
  result->GetXaxis()->SetTitle("N_{event}");
  result->GetYaxis()->SetTitle(fLabel.Data());
  if (fMax > fMin) {
    result->SetMinimum(fMin);
    result->SetMaximum(fMax);
  }
  result->SetOption("L");

  Double_t sum = 0;
  Double_t sum2 = 0;
  for (Int_t i = 0; i < nBins; i++) {
    Double_t data = fData[fNumberOfEvents-1-i];
    sum += data;
    sum2 += data * data;
    result->SetBinContent(nBins-i, data);
  }
  Stat_t stats[4];
  stats[0] = nBins;
  stats[1] = nBins * nBins;
  stats[2] = sum;
  stats[3] = sum2;
  result->PutStats(stats);

  return result;
}

//_____________________________________________________________________________
Double_t AliMonitorTrend::GetMean() const
{
// get the mean value

  if (fNumberOfEvents <= 0) return 0;

  Double_t sum = 0;
  for (Int_t i = 0; i < fNumberOfEvents; i++) {
    sum += fData[i];
  }
  return sum / fNumberOfEvents;
}

//_____________________________________________________________________________
Double_t AliMonitorTrend::GetSigma() const
{
// get the rms value

  if (fNumberOfEvents <= 0) return 0;

  Double_t sum = 0;
  Double_t sum2 = 0;
  for (Int_t i = 0; i < fNumberOfEvents; i++) {
    sum += fData[i];
    sum2 += fData[i] * fData[i];
  }
  return TMath::Sqrt(sum2 - sum*sum/fNumberOfEvents) / fNumberOfEvents;
}
Commit	Line	Data
04fa961a	1	/**************************************************************************
	2	* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
	3	* *
	4	* Author: The ALICE Off-line Project. *
	5	* Contributors are mentioned in the code where appropriate. *
	6	* *
	7	* Permission to use, copy, modify and distribute this software and its *
	8	* documentation strictly for non-commercial purposes is hereby granted *
	9	* without fee, provided that the above copyright notice appears in all *
	10	* copies and that both the copyright notice and this permission notice *
	11	* appear in the supporting documentation. The authors make no claims *
	12	* about the suitability of this software for any purpose. It is *
	13	* provided "as is" without express or implied warranty. *
	14	**************************************************************************/
	15
	16	/* $Id$ */
	17
	18	///////////////////////////////////////////////////////////////////////////////
	19	// //
	20	// This class maintains a plot for the evolution of a value that is used //
	21	// tomonitor the quality of the recorded data. //
	22	// The trendgram is created and filled by a sub class of AliMonitor. //
	23	// It can be compared to a reference trendgram. For the comparison a //
	24	// maximal deviation (in standard deviations) can be specified. //
	25	// The bins where the maximal deviation is exceeded are drawn in red. //
	26	// //
	27	///////////////////////////////////////////////////////////////////////////////
	28
	29
c4bd737c	30	#include <TH1.h>
04fa961a	31	#include <TVirtualPad.h>
	32	#include <TLine.h>
	33
7ba8900c	34	#include "AliLog.h"
	35
	36	#include "AliMonitorTrend.h"
	37
04fa961a	38
	39	ClassImp(AliMonitorTrend)
	40
	41
	42	Int_t AliMonitorTrend::fgIncSize = 10;
	43
	44
	45	//_____________________________________________________________________________
17c3cc9e	46	AliMonitorTrend::AliMonitorTrend():
	47	AliMonitorPlot(),
	48	fLabel(),
	49	fMin(0),
	50	fMax(0),
	51	fData(),
	52	fHistoDraw(NULL),
	53	fRefMean(0),
	54	fRefSigma(-1),
	55	fHistoCompare(NULL)
04fa961a	56	{
	57	// default contructor
	58
04fa961a	59	}
	60
	61	//_____________________________________________________________________________
	62	AliMonitorTrend::AliMonitorTrend(const AliMonitorTrend& trend) :
17c3cc9e	63	AliMonitorPlot(trend),
	64	fLabel(trend.fLabel),
	65	fMin(trend.fMin),
	66	fMax(trend.fMax),
	67	fData(trend.fData),
	68	fHistoDraw(NULL),
	69	fRefMean(trend.fRefMean),
	70	fRefSigma(trend.fRefSigma),
	71	fHistoCompare(NULL)
04fa961a	72	{
	73	// copy constructor
	74
04fa961a	75	}
04fa961a	76
c4bd737c	77	//_____________________________________________________________________________
	78	AliMonitorTrend& AliMonitorTrend::operator =(const AliMonitorTrend& trend)
	79	{
	80	// assignment operator
	81
	82	AliMonitorPlot::operator =(trend);
	83
	84	fLabel = trend.fLabel;
	85	fMin = trend.fMin;
	86	fMax = trend.fMax;
	87	trend.fData.Copy(fData);
	88
	89	fHistoDraw = NULL;
	90	fRefMean = trend.fRefMean;
	91	fRefSigma = trend.fRefSigma;
	92	fHistoCompare = NULL;
	93
	94	return *this;
	95	}
	96
04fa961a	97	//_____________________________________________________________________________
	98	AliMonitorTrend::AliMonitorTrend(const char* name, const char* title,
	99	const char* label, Double_t min, Double_t max) :
17c3cc9e	100	AliMonitorPlot(name, title),
	101	fLabel(label),
	102	fMin(min),
	103	fMax(max),
	104	fData(),
	105	fHistoDraw(NULL),
	106	fRefMean(0),
	107	fRefSigma(0),
	108	fHistoCompare(NULL)
04fa961a	109	{
	110	// create a monitor trend
	111
04fa961a	112	}
	113
	114	//_____________________________________________________________________________
	115	AliMonitorTrend::~AliMonitorTrend()
	116	{
	117	// delete all histograms
	118
	119	if (fHistoDraw) delete fHistoDraw;
	120	if (fHistoCompare) delete fHistoCompare;
	121	}
	122
	123
	124	//_____________________________________________________________________________
	125	void AliMonitorTrend::SetReference(TH1* ref)
	126	{
	127	// set the reference trend for comparison
	128
	129	Int_t n = ref->GetXaxis()->GetNbins();
	130	if (n <= 0) return;
	131
	132	Double_t sum = 0;
	133	Double_t sum2 = 0;
	134	for (Int_t i = 1; i <= n; i++) {
	135	sum += ref->GetBinContent(i);
	136	sum2 += ref->GetBinContent(i) * ref->GetBinContent(i);
	137	}
	138
	139	fRefMean = sum / n;
	140	fRefSigma = TMath::Sqrt(sum2 - sum*sum/n) / n;
	141	}
	142
	143	//_____________________________________________________________________________
	144	void AliMonitorTrend::SetReference(AliMonitorPlot* ref)
	145	{
	146	// set the reference trendgram for comparison
	147
	148	if (!ref->InheritsFrom(AliMonitorTrend::Class())) return;
	149	fRefMean = ((AliMonitorTrend*)ref)->GetMean();
	150	fRefSigma = ((AliMonitorTrend*)ref)->GetSigma();
	151	}
	152
	153
	154	//_____________________________________________________________________________
	155	void AliMonitorTrend::Fill(Double_t x)
	156	{
	157	// add a value to the monitor trend
	158
	159	if (fNumberOfEvents >= fData.GetSize()) {
	160	fData.Set(fNumberOfEvents + fgIncSize);
	161	}
	162	fData[fNumberOfEvents] = x;
	163	}
	164
	165
	166	//_____________________________________________________________________________
	167	void AliMonitorTrend::Update()
	168	{
	169	// update
	170
	171	fNumberOfEvents++;
	172	}
	173
	174	//_____________________________________________________________________________
	175	void AliMonitorTrend::Add(AliMonitorPlot* plot)
176	{
177	// merge the given trend to this one
178
179	if (!plot->InheritsFrom(AliMonitorTrend::Class())) return;
180	AliMonitorTrend* trend = (AliMonitorTrend*) plot;
181
182	Int_t numberOfEvents = fNumberOfEvents + trend->fNumberOfEvents;
183	if (numberOfEvents >= fData.GetSize()) {
184	fData.Set(numberOfEvents + fgIncSize);
185	}
186	for (Int_t i = 0; i < trend->fNumberOfEvents; i++) {
187	fData[fNumberOfEvents + i] = trend->fData[i];
188	}
189	fNumberOfEvents = numberOfEvents;
190	}
191
192	//_____________________________________________________________________________
193	void AliMonitorTrend::Reset()
194	{
195	// reset the monitor trend for a new run
196
197	fData.Set(fgIncSize);
198	if (fHistoDraw) delete fHistoDraw;
199	fHistoDraw = NULL;
200	if (fHistoCompare) delete fHistoCompare;
201	fHistoCompare = NULL;
202	fNumberOfEvents = 0;
203	}
204
205	//_____________________________________________________________________________
206	void AliMonitorTrend::ResetList()
207	{
208	// reset the the list of monitor histograms
209	// (not applicable for trend)
210
211	}
212
213
214	//_____________________________________________________________________________
215	Bool_t AliMonitorTrend::ComparePlot()
216	{
217	// compare the data trend to the reference
218	// if they deviate by more than fgThreshold standard deviations in a bin,
219	// this bin is set in fHistoCompare and kFALSE is returned
220
221	if (fRefSigma < 0) return kTRUE;
222	if (fgThreshold <= 0) return kTRUE;
223	if (!fHistoDraw) {
7ba8900c	224	AliWarning("no data trend available for comparison\ncall DrawSum or DrawRaw before calling Compare");
04fa961a	225	return kTRUE;
	226	}
	227
	228	Int_t nBins = fHistoDraw->GetXaxis()->GetNbins();
	229	if (fHistoCompare) delete fHistoCompare;
	230	fHistoCompare = CreateHisto(nBins);
	231	fHistoCompare->Reset();
	232	fHistoCompare->SetOption("P");
	233	fHistoCompare->SetMarkerStyle(kFullCircle);
	234	fHistoCompare->SetFillStyle(0);
	235	Bool_t result = kTRUE;
	236
	237	for (Int_t iBin = 1; iBin <= nBins; iBin++) {
	238	Double_t delta = TMath::Abs(fHistoDraw->GetBinContent(iBin) - fRefMean);
	239	if (delta > fgThreshold*fRefSigma) {
	240	fHistoCompare->SetBinContent(iBin, fHistoDraw->GetBinContent(iBin));
	241	result = kFALSE;
	242	}
	243	}
	244
	245	return result;
	246	}
	247
	248	//_____________________________________________________________________________
	249	Bool_t AliMonitorTrend::GetEvent(Int_t)
	250	{
	251	// there is no single event trend
	252
97d6eb66	253	// Info("GetEvent", "there is no trend for single events available");
04fa961a	254	return kFALSE;
	255	}
	256
	257	//_____________________________________________________________________________
	258	Bool_t AliMonitorTrend::GetSum(Int_t number)
	259	{
	260	// get the monitor trend for the last "number" events
	261
	262	if (number > fNumberOfEvents) {
7ba8900c	263	AliError(Form("requested number of events (%d) exceeds range of available events (%d)\nusing last %d event(s)",
7ba8900c	264	number, fNumberOfEvents, fNumberOfEvents));
04fa961a	265	number = fNumberOfEvents;
	266	}
	267	if (number <= 0) return kFALSE;
	268
	269	if (fHistoDraw) delete fHistoDraw;
	270	if (fHistoCompare) delete fHistoCompare;
	271	fHistoCompare = NULL;
	272
	273	fHistoDraw = CreateHisto(number);
	274	return kTRUE;
	275	}
	276
	277	//_____________________________________________________________________________
	278	Bool_t AliMonitorTrend::GetRun()
	279	{
	280	// get the monitor trend for all monitored events of the current run
	281
	282	if (fHistoDraw) delete fHistoDraw;
	283	if (fHistoCompare) delete fHistoCompare;
	284	fHistoCompare = NULL;
	285	if (fNumberOfEvents <= 0) return kFALSE;
	286
	287	fHistoDraw = CreateHisto(fNumberOfEvents);
	288	return kTRUE;
	289	}
	290
	291	//_____________________________________________________________________________
	292	void AliMonitorTrend::DrawPlot()
	293	{
	294	// draw the trendgrams
	295
	296	fHistoDraw->SetMarkerColor(fgColorData);
	297	fHistoDraw->SetLineColor(fgColorData);
	298	fHistoDraw->SetLineWidth(2);
	299	fHistoDraw->DrawCopy();
	300
	301	if ((fRefSigma > 0) && fgDrawRef) {
	302	if ((fRefMean+fRefSigma > fHistoDraw->GetMaximum()) && !(fMax > fMin)) {
	303	fHistoDraw->SetMaximum(fRefMean+fRefSigma * 1.1);
	304	}
	305
	306	Double_t xMin = fHistoDraw->GetXaxis()->GetXmin();
	307	Double_t xMax = fHistoDraw->GetXaxis()->GetXmax();
	308	TLine* mean = new TLine(xMin, fRefMean, xMax, fRefMean);
	309	mean->SetLineColor(fgColorRef);
	310	mean->SetLineWidth(2);
	311	mean->Draw();
	312	TLine* high = new TLine(xMin, fRefMean+fRefSigma,
	313	xMax, fRefMean+fRefSigma);
	314	high->SetLineColor(fgColorRef);
	315	high->SetLineWidth(2);
	316	high->SetLineStyle(2);
	317	high->Draw();
	318	TLine* low = new TLine(xMin, fRefMean-fRefSigma,
	319	xMax, fRefMean-fRefSigma);
	320	low->SetLineColor(fgColorRef);
	321	low->SetLineWidth(2);
	322	low->SetLineStyle(2);
	323	low->Draw();
	324
	325	// char option[256];
	326	// sprintf(option, "%sSAME", fHistoDraw->GetOption());
	327	// fHistoDraw->DrawCopy(option);
	328
329	if (fHistoCompare && (fgThreshold > 0)) {
330	char option[256];
331	sprintf(option, "%sSAME", fHistoCompare->GetOption());
332	fHistoCompare->SetMarkerColor(fgColorCompare);
333	fHistoCompare->SetLineColor(fgColorCompare);
334	fHistoCompare->SetLineWidth(2);
335	fHistoCompare->DrawCopy(option);
336	}
337	}
338
339	gPad->Update();
340	}
341
342
343	//_____________________________________________________________________________
344	TH1* AliMonitorTrend::CreateHisto(Int_t nBins)
345	{
346	// create a histogram for a trend plot with the last nBin entries
347
348	TH1* result = new TH1D(GetName(), GetTitle(), nBins, -nBins-0.5, -0.5);
349	result->GetXaxis()->SetTitle("N_{event}");
350	result->GetYaxis()->SetTitle(fLabel.Data());
351	if (fMax > fMin) {
352	result->SetMinimum(fMin);
353	result->SetMaximum(fMax);
354	}
355	result->SetOption("L");
356
357	Double_t sum = 0;
358	Double_t sum2 = 0;
359	for (Int_t i = 0; i < nBins; i++) {
360	Double_t data = fData[fNumberOfEvents-1-i];
361	sum += data;
362	sum2 += data * data;
363	result->SetBinContent(nBins-i, data);
364	}
365	Stat_t stats[4];
366	stats[0] = nBins;
367	stats[1] = nBins * nBins;
368	stats[2] = sum;
369	stats[3] = sum2;
370	result->PutStats(stats);
371
372	return result;
373	}
374
375	//_____________________________________________________________________________
c4bd737c	376	Double_t AliMonitorTrend::GetMean() const
04fa961a	377	{
	378	// get the mean value
	379
	380	if (fNumberOfEvents <= 0) return 0;
	381
	382	Double_t sum = 0;
	383	for (Int_t i = 0; i < fNumberOfEvents; i++) {
	384	sum += fData[i];
	385	}
	386	return sum / fNumberOfEvents;
	387	}
	388
	389	//_____________________________________________________________________________
c4bd737c	390	Double_t AliMonitorTrend::GetSigma() const
04fa961a	391	{
	392	// get the rms value
	393
	394	if (fNumberOfEvents <= 0) return 0;
	395
	396	Double_t sum = 0;
	397	Double_t sum2 = 0;
	398	for (Int_t i = 0; i < fNumberOfEvents; i++) {
	399	sum += fData[i];
	400	sum2 += fData[i] * fData[i];
	401	}
	402	return TMath::Sqrt(sum2 - sum*sum/fNumberOfEvents) / fNumberOfEvents;
	403	}
	404