EcalCondTools Namespace Reference

Functions
def	compare (tag1, db1, since1, tag2, db2, since2, filename='compare.root')
def	compareBarrel (coeff_barl_1, coeff_barl_2)
def	compareBarrelBorder (coeff_barl_1, coeff_barl_2)
def	compareEndcap (coeff_endc_1, coeff_endc_2)
def	compareEndcapBorder (coeff_endc_1, coeff_endc_2)
def	dumpXML (db, tag, since, filename='dump.xml')
def	getObject (db, tag, since)
def	getToken (db, tag, since)
def	histo (db, tag, since, filename='histo.root')
def	listIovs (db, tag)
def	listTags (db)
def	makedist (coeff_barl, coeff_endc)
def	plot (db, tag, since, filename='plot.root')

Function Documentation

def EcalCondTools.compare	(		tag1,
			db1,
			since1,
			tag2,
			db2,
			since2,
			filename = 'compare.root'
	)

Produce comparison plots for two records. Save plots to file \
   according to format. tag can be an xml file

Definition at line 89 of file EcalCondTools.py.

References compareBarrel(), compareBarrelBorder(), compareEndcap(), compareEndcapBorder(), EcalPyUtils.fromXML(), and harvestTrackValidationPlots.str.

Referenced by plot(), and EcalCondDB.usage().

            tag2,db2,since2,filename='compare.root'):
  '''Produce comparison plots for two records. Save plots to file \
     according to format. tag can be an xml file'''
  print "EcalCondTools.py compare tag1 ", tag1, "since1 : ", since1, " tag2 ", tag2," s2 ", since2

  coeff_1_b=[]
  coeff_2_b=[]

  coeff_1_e=[]
  coeff_2_e=[]
  
  if  tag1.find(".xml") < 0:
      found=0
      try:
        db1.startReadOnlyTransaction()
        Plug = __import__(str(db1.payloadModules(tag1)[0]))
        payload = Plug.Object(db1)
        listOfIovElem= [iovElem for iovElem in db1.iov(tag1).elements]
        what = {'how':'barrel'}
        w = inspect.setWhat(Plug.What(),what)
        exb = Plug.Extractor(w)
        what = {'how':'endcap'}
        w = inspect.setWhat(Plug.What(),what)
        exe = Plug.Extractor(w)
#        p = getObject(db1,tag1,since1,ex)
#        p.extract(ex)
        print " before loop"
        for elem in db1.iov(tag1).elements :       
          if str(elem.since())==str(since1):
            found=1
            payload.load(elem)
            payload.extract(exb)
            coeff_1_b = [i for i in exb.values()]# first set of coefficients
            payload.extract(exe)
            coeff_1_e = [i for i in exe.values()]
        db1.commitTransaction()

      except Exception as er :
        print " compare first set exception ",er
      if not found :
        print "Could not retrieve payload for tag: " , tag1, " since: ", since1
        sys.exit(0)

  else:
      coeff_1_b,coeff_1_e = EcalPyUtils.fromXML(tag1)

  if  tag2.find(".xml")<0:
      found=0
      try:  
        db2.startReadOnlyTransaction()
        Plug = __import__(str(db2.payloadModules(tag2)[0]))
        what = {'how':'barrel'}
        w = inspect.setWhat(Plug.What(),what)
        exb = Plug.Extractor(w)
        what = {'how':'endcap'}
        w = inspect.setWhat(Plug.What(),what)
        exe = Plug.Extractor(w)
#        p = getObject(db2,tag2,since2)
#        p.extract(ex)
        for elem in db2.iov(tag2).elements :       
          if str(elem.since())==str(since2):
            found=1
            payload.load(elem)
            payload.extract(exb)
            coeff_2_b = [i for i in exb.values()]# second set of coefficients
            payload.extract(exe)
            coeff_2_e = [i for i in exe.values()]
        db2.commitTransaction()
     
      except Exception as er :
          print " compare second set exception ",er
      if not found :
        print "Could not retrieve payload for tag: " , tag2, " since: ", since2
        sys.exit(0)

  else:
      coeff_2_b,coeff_2_e = EcalPyUtils.fromXML(tag2)

  gStyle.SetPalette(1)    

  savefile = TFile(filename,"RECREATE")

  ebhisto,ebmap, profx, profy= compareBarrel(coeff_1_b,coeff_2_b)
  eephisto,eepmap,eemhisto,eemmap=compareEndcap(coeff_1_e,coeff_2_e)

#make more canvas (suppressed : use a root file)

#  cEBdiff = TCanvas("EBdiff","EBdiff")
#  cEBdiff.Divide(2,2)

#  cEBdiff.cd(1)
#  ebhisto.Draw()
#  cEBdiff.cd(2)
#  ebmap.Draw("colz")
#  cEBdiff.cd(3)
#  profx.Draw()
#  cEBdiff.cd(4)
#  profy.Draw()

#  EBfilename = "EB_"+filename
#  cEBdiff.SaveAs(EBfilename)

#  cEEdiff = TCanvas("EEdiff","EEdiff")
#  cEEdiff.Divide(2,2)
  
#  cEEdiff.cd(1)
#  eephisto.Draw()
#  cEEdiff.cd(2)
#  eepmap.Draw("colz")
#  cEEdiff.cd(3)
#  eemhisto.Draw()
#  cEEdiff.cd(4)
#  eemmap.Draw("colz")

#  EEfilename = "EE_"+filename
#  cEEdiff.SaveAs(EEfilename)


  eeborderphisto,eeborderpmap,eebordermhisto,eebordermmap=compareEndcapBorder(coeff_1_e,coeff_2_e)
  ebborderhisto,ebbordermap = compareBarrelBorder(coeff_1_b,coeff_2_b)

  border_diff_distro_can = TCanvas("border_difference","borders difference")
  border_diff_distro_can.Divide(2,3)

  border_diff_distro_can.cd(1)
  ebborderhisto.Draw()
  border_diff_distro_can.cd(2)
  ebbordermap.Draw("colz")
  border_diff_distro_can.cd(3)
  eeborderphisto.Draw()
  border_diff_distro_can.cd(4)
  eeborderpmap.Draw("colz")
  border_diff_distro_can.cd(5)
  eebordermhisto.Draw()
  border_diff_distro_can.cd(6)
  eebordermmap.Draw("colz")

  bordersfilename = "borders_"+filename
  prof_filename = "profiles_"+filename
  
#  border_diff_distro_can.SaveAs(bordersfilename)

  savefile.Write()

def EcalCondTools.compareBarrel	(		coeff_barl_1,
			coeff_barl_2
	)

Return an histogram and a map of the differences 

Definition at line 427 of file EcalCondTools.py.

References EcalPyUtils.unhashEBIndex().

Referenced by compare().

def compareBarrel(coeff_barl_1,coeff_barl_2) :
  '''Return an histogram and a map of the differences '''

  diff_distro_h   = TH1F("diffh","diffh",100,-2,2)
  diff_distro_m   = TH2F("diffm","diffm",360,1,361,171,-85,86)
  diff_distro_m.SetStats(0)
  ebeta = TH2F("ebeta","ebeta",171,-85,86,100,-2,2)
  ebphi = TH2F("ebphi","ebphi",360,1,361,100,-2,2)

  
  for i,c in enumerate(coeff_barl_1):  
      diff = c - coeff_barl_2[i]      
      ieta,iphi= EcalPyUtils.unhashEBIndex(i)
      diff_distro_h.Fill(diff) 
      diff_distro_m.Fill(iphi,ieta,diff)
      ebeta.Fill(ieta,diff)
      ebphi.Fill(iphi,diff)

  prof_x_h = ebeta.ProfileX()
  prof_y_h = ebphi.ProfileX()
          
  return diff_distro_h, diff_distro_m, prof_x_h, prof_y_h

def EcalCondTools.compareBarrelBorder	(		coeff_barl_1,
			coeff_barl_2
	)

Return an histogram and a map of the differences 

Definition at line 452 of file EcalCondTools.py.

References funct.abs(), and EcalPyUtils.unhashEBIndex().

Referenced by compare().

def compareBarrelBorder(coeff_barl_1,coeff_barl_2) :
  '''Return an histogram and a map of the differences '''

  diff_distro_border_h   = TH1F("diffborderh","diffh",100,-2,2)
  diff_distro_border_m   = TH2F("diffborderm","diffm",360,1,361,171,-85,86)
  diff_distro_border_m.SetStats(0)
  
  for i,c in enumerate(coeff_barl_1):  
      diff = c - coeff_barl_2[i]      
      ieta,iphi= EcalPyUtils.unhashEBIndex(i)
      if (abs(ieta)==85 or abs(ieta)==65 or abs(ieta)==64 or abs(ieta)==45 or abs(ieta)==44 or abs(ieta)==25 or abs(ieta)==24 or abs(ieta)==1 or iphi%20==1 or iphi%20==0):
          diff_distro_border_h.Fill(diff) 
      if (abs(ieta)==85 or abs(ieta)==65 or abs(ieta)==64 or abs(ieta)==45 or abs(ieta)==44 or abs(ieta)==25 or abs(ieta)==24 or abs(ieta)==1 or iphi%20==0 or iphi%20==1): 
          diff_distro_border_m.Fill(iphi,ieta,diff)
          
  return diff_distro_border_h, diff_distro_border_m 




    

def EcalCondTools.compareEndcap	(		coeff_endc_1,
			coeff_endc_2
	)

Return an histogram and a map of the differences for each endcap

Definition at line 473 of file EcalCondTools.py.

References mathSSE.sqrt(), and EcalPyUtils.unhashEEIndex().

Referenced by compare().

def compareEndcap(coeff_endc_1, coeff_endc_2) :
    ''' Return an histogram and a map of the differences for each endcap'''

    diff_distro_h_eep   = TH1F("diff EE+","diff EE+",100,-2,2)
    diff_distro_h_eem   = TH1F("diff EE-","diff EE-",100,-2,2)

    
    diff_distro_m_eep   = TH2F("map EE+","map EE+",100,1,101,100,1,101)
    diff_distro_m_eem   = TH2F("map EE-","map EE-",100,1,101,100,1,101)

    temp_h = TH1F("tempR","tempR",50,0,50)
    
    diff_distro_m_eep.SetStats(0)
    diff_distro_m_eem.SetStats(0)


    for i,c in enumerate(coeff_endc_1):  
      diff = c - coeff_endc_2[i]
      ix,iy,iz = EcalPyUtils.unhashEEIndex(i)
      R = sqrt((ix-50)*(ix-50)+(iy-50)*(iy-50))
      
      if iz >0:
          diff_distro_h_eep.Fill(diff)
          diff_distro_m_eep.Fill(ix,iy,diff)
          
      else:
          diff_distro_h_eem.Fill(diff)
          diff_distro_m_eem.Fill(ix,iy,diff)

    return diff_distro_h_eep, \
           diff_distro_m_eep, \
           diff_distro_h_eem, \
           diff_distro_m_eem

def EcalCondTools.compareEndcapBorder	(		coeff_endc_1,
			coeff_endc_2
	)

Return an histogram and a map of the differences for each endcap

Definition at line 509 of file EcalCondTools.py.

References EcalPyUtils.unhashEEIndex().

Referenced by compare().

def compareEndcapBorder(coeff_endc_1, coeff_endc_2) :
    ''' Return an histogram and a map of the differences for each endcap'''

    border_diff_distro_h_eep   = TH1F("borderdiff EE+","diff EE+",100,-2,2)
    border_diff_distro_h_eem   = TH1F("borderdiff EE-","diff EE-",100,-2,2)

    
    border_diff_distro_m_eep   = TH2F("bordermap EE+","map EE+",100,1,101,100,1,101)
    border_diff_distro_m_eem   = TH2F("bordermap EE-","map EE-",100,1,101,100,1,101)
    
    border_diff_distro_m_eep.SetStats(0)
    border_diff_distro_m_eem.SetStats(0)


    for i,c in enumerate(coeff_endc_1):  
      diff = c - coeff_endc_2[i]
      ix,iy,iz = EcalPyUtils.unhashEEIndex(i)
      Rsq = ((ix-50.0)**2+(iy-50.0)**2)
      
      if (iz >0 and (Rsq<144.0 or Rsq>2500.0)):
          border_diff_distro_h_eep.Fill(diff)
          border_diff_distro_m_eep.Fill(ix,iy,diff)
      elif (iz<0 and (Rsq<144.0 or Rsq>2500.0)):
          border_diff_distro_h_eem.Fill(diff)
          border_diff_distro_m_eem.Fill(ix,iy,diff)
      

    return border_diff_distro_h_eep, \
           border_diff_distro_m_eep, \
           border_diff_distro_h_eem, \
           border_diff_distro_m_eem

def EcalCondTools.dumpXML	(		db,
			tag,
			since,
			filename = 'dump.xml'
	)

Dump record in XML format for a given tag 

Definition at line 42 of file EcalCondTools.py.

References harvestTrackValidationPlots.str.

Referenced by EcalFloatCondObjectContainerXMLTranslator.dumpXML(), EcalCondDB.usage(), EcalTPGCrystalStatusXMLTranslator.writeXML(), EcalTPGLinearizationConstXMLTranslator.writeXML(), ESGainXMLTranslator.writeXML(), EcalTimeBiasCorrectionsXMLTranslator.writeXML(), EcalClusterLocalContCorrXMLTranslator.writeXML(), EcalTPGStripStatusXMLTranslator.writeXML(), EcalTPGTowerStatusXMLTranslator.writeXML(), EcalAlignmentXMLTranslator.writeXML(), EcalDAQTowerStatusXMLTranslator.writeXML(), EcalPedestalsXMLTranslator.writeXML(), EcalPulseShapesXMLTranslator.writeXML(), EcalPulseSymmCovariancesXMLTranslator.writeXML(), EcalDCSTowerStatusXMLTranslator.writeXML(), EcalChannelStatusXMLTranslator.writeXML(), EcalClusterCrackCorrXMLTranslator.writeXML(), EcalLaserAPDPNRatiosXMLTranslator.writeXML(), EcalLinearCorrectionsXMLTranslator.writeXML(), EcalGainRatiosXMLTranslator.writeXML(), EcalClusterEnergyCorrectionXMLTranslator.writeXML(), EcalWeightGroupXMLTranslator.writeXML(), EcalClusterEnergyCorrectionObjectSpecificXMLTranslator.writeXML(), EcalTimeOffsetXMLTranslator.writeXML(), EcalTBWeightsXMLTranslator.writeXML(), EcalADCToGeVXMLTranslator.writeXML(), EcalWeightSetXMLTranslator.writeXML(), and EcalFloatCondObjectContainerXMLTranslator.writeXML().

def dumpXML(db,tag,since,filename='dump.xml'):
    '''Dump record in XML format for a given tag '''
    try :
       iov = inspect.Iov(db,tag)
       db.startReadOnlyTransaction()
       Plug = __import__(str(db.payloadModules(tag)[0]))
       payload = Plug.Object(db)
       listOfIovElem= [iovElem for iovElem in db.iov(tag).elements]
       inst = 0
       for elem in db.iov(tag).elements :
           inst = inst + 1
           if str(elem.since())==str(since):
               found = inst
               break
       db.commitTransaction()
       payload = inspect.PayLoad(db, tag, elem)
       out = open(filename,'w')
       print >> out, payload
      
    except Exception as er :
        print " dumpXML exception ",er

def EcalCondTools.getObject	(		db,
			tag,
			since
	)

Return payload object for a given iov, tag, db

Definition at line 348 of file EcalCondTools.py.

References harvestTrackValidationPlots.str.

def getObject(db,tag,since):
    ''' Return payload object for a given iov, tag, db'''
    found=0
    try:
#       exec('import '+db.moduleName(tag)+' as Plug')  
       db.startReadOnlyTransaction()
       Plug = __import__(str(db.payloadModules(tag)[0]))
       print " getObject Plug"
       payload = Plug.Object(db)
       db.commitTransaction()
       listOfIovElem= [iovElem for iovElem in db.iov(tag).elements]
       print " getObject before loop"
       for elem in db.iov(tag).elements :       
           if str(elem.since())==str(since):
               found=1
               print " getObject found ", elem.since()
#               return Plug.Object(elem)
               return elem
           
    except Exception as er :
        print " getObject exception ",er

    if not found :
        print "Could not retrieve payload for tag: " , tag, " since: ", since
        sys.exit(0)

def EcalCondTools.getToken	(		db,
			tag,
			since
	)

Return payload token for a given iov, tag, db

Definition at line 332 of file EcalCondTools.py.

References harvestTrackValidationPlots.str.

Referenced by edm::EventProcessor.processConfiguration().

def getToken(db,tag,since):
    ''' Return payload token for a given iov, tag, db'''
    try :
       iov = inspect.Iov(db,tag)
       iovlist = iov.list()
       for p in iovlist:
           tmpsince=p[1]
           if str(tmpsince)==str(since) :
               return p[0]
       print "Could not retrieve token for tag: " , tag, " since: ", since
       sys.exit(0)
       
    except Exception as er :
       print er

def EcalCondTools.histo	(		db,
			tag,
			since,
			filename = 'histo.root'
	)

Make histograms and save to file. tag can be an xml file

Definition at line 235 of file EcalCondTools.py.

References EcalPyUtils.fromXML(), makedist(), and harvestTrackValidationPlots.str.

Referenced by EcalCondDB.usage().

def histo (db, tag,since,filename='histo.root'):
    '''Make histograms and save to file. tag can be an xml file'''
    
    coeff_barl=[]
    coeff_endc=[]
    
    if  tag.find(".xml")< 0:
      found=0
      try:  
#          exec('import '+db.moduleName(tag)+' as Plug')
        db.startReadOnlyTransaction()
        Plug = __import__(str(db.payloadModules(tag)[0]))
        payload = Plug.Object(db)
        listOfIovElem= [iovElem for iovElem in db.iov(tag).elements]
        what = {'how':'barrel'}
        w = inspect.setWhat(Plug.What(),what)
        exb = Plug.Extractor(w)
        what = {'how':'endcap'}
        w = inspect.setWhat(Plug.What(),what)
        exe = Plug.Extractor(w)
        for elem in db.iov(tag).elements :       
          if str(elem.since())==str(since):
            found=1
            payload.load(elem)
            payload.extract(exb)
            coeff_barl = [i for i in exb.values()]
            payload.extract(exe)
            coeff_endc = [i for i in exe.values()]
        db.commitTransaction()

      except Exception as er :
          print " histo exception ",er
      if not found :
        print "Could not retrieve payload for tag: " , tag, " since: ", since
        sys.exit(0)

    else :
      coeff_barl,coeff_endc=EcalPyUtils.fromXML(tag)

    savefile = TFile(filename,"RECREATE")

    ebmap, ebeta, ebphi, eePmap, ebdist, eeMmap, prof_eePL, prof_eePR, prof_eeML, prof_eeMR, ebBorderdist = makedist(coeff_barl, coeff_endc)

    gStyle.SetPalette(1)

    c =  TCanvas("CCdist")
    c.Divide(2,2)

    c.cd(1)  
    ebmap.Draw("colz")
    c.cd(2)
    eePmap.Draw("colz")
    c.cd(3)
    ebdist.Draw()
    c.cd(4)
    eeMmap.Draw("colz")

#    c.SaveAs(filename)

    prof_eb_eta = ebeta.ProfileX()
    prof_eb_phi = ebphi.ProfileX()

    c2 = TCanvas("CCprofiles")
    c2.Divide(2,2)

    leg = TLegend(0.1,0.7,0.48,0.9)

    c2.cd(1)
    prof_eb_eta.Draw()
    c2.cd(2)
    prof_eb_phi.Draw()
    c2.cd(3)
    prof_eePL.SetMarkerStyle(8)
    prof_eePL.Draw()
    prof_eePR.SetMarkerStyle(8)
    prof_eePR.SetMarkerColor(2)
    prof_eePR.Draw("same")
    prof_eeML.SetMarkerStyle(8)
    prof_eeML.SetMarkerColor(3)
    prof_eeML.Draw("same")
    prof_eeMR.SetMarkerStyle(8)
    prof_eeMR.SetMarkerColor(5)
    prof_eeMR.Draw("same")
    leg.AddEntry(prof_eePL,"Dee1","lp")
    leg.AddEntry(prof_eePR,"Dee2","lp")
    leg.AddEntry(prof_eeMR,"Dee3","lp")
    leg.AddEntry(prof_eeML,"Dee4","lp")
    leg.Draw()
    c2.cd(4)
    ebBorderdist.Draw()

    extrafilename = "profiles_"+filename
 #   c2.SaveAs(extrafilename)

    savefile.Write()      

def EcalCondTools.listIovs	(		db,
			tag
	)

List all available iovs for a given tag

Definition at line 29 of file EcalCondTools.py.

Referenced by EcalCondDB.usage().

def listIovs(db,tag):
    '''List all available iovs for a given tag'''

    try :
       iov = inspect.Iov(db,tag)
       iovlist = iov.list()
       print "Available iovs for tag: ",tag
       for p in iovlist:
           print "  Since " , p[1], " Till " , p[2]
     
    except Exception as er :
        print " listIovs exception ",er 

def EcalCondTools.listTags

(

db

)

List all available tags for a given db 

Definition at line 18 of file EcalCondTools.py.

Referenced by EcalCondDB.usage().

def listTags(db):
    '''List all available tags for a given db '''
    try:
        db.startReadOnlyTransaction()
        tags = db.allTags()
        db.commitTransaction()
        for tag in tags.split():
            print tag
    except:
        return ""

def EcalCondTools.makedist	(		coeff_barl,
			coeff_endc
	)

Definition at line 375 of file EcalCondTools.py.

References funct.abs(), mathSSE.sqrt(), EcalPyUtils.unhashEBIndex(), and EcalPyUtils.unhashEEIndex().

Referenced by histo().

def makedist(coeff_barl, coeff_endc) :

    ebmap = TH2F("EB","EB",360,1,261,171, -85,86)
    eePmap = TH2F("EE","EE",100, 1,101,100,1,101)
    eeMmap = TH2F("EEminus","EEminus",100,1,101,100,1,101)
    ebdist = TH1F("EBdist","EBdist",100,-2,2)
    ebBorderdist = TH1F("EBBorderdist","EBBorderdist",100,-2,2)

    ebeta = TH2F("ebeta","ebeta",171,-85,86,100,-2,2)
    ebphi = TH2F("ebphi","ebphi",360,1,361,100,-2,2)

    eePL = TH2F("EEPL","EEPlus Left",50,10,55,100,-2,2)
    eePR = TH2F("EEPR","EEPlus Right",50,10,55,100,-2,2)
    eeML = TH2F("EEML","EEMinus Left",50,10,55,100,-2,2)
    eeMR = TH2F("EEMR","EEMinus Right",50,10,55,100,-2,2)
    
    for i,c in enumerate(coeff_barl):
        ieta,iphi = EcalPyUtils.unhashEBIndex(i)
        ebmap.Fill(iphi,ieta,c)
        ebdist.Fill(c)
        ebeta.Fill(ieta,c)
        ebphi.Fill(iphi,c)

        if (abs(ieta)==85 or abs(ieta)==65 or abs(ieta)==64 or abs(ieta)==45 or abs(ieta)==44 or abs(ieta)==25 or abs(ieta)==24 or abs(ieta)==1 or iphi%20==1 or iphi%20==0):
            ebBorderdist.Fill(c)


    for i,c in enumerate(coeff_endc):
        ix,iy,iz = EcalPyUtils.unhashEEIndex(i)
        R = sqrt((ix-50)*(ix-50)+(iy-50)*(iy-50))

        if  iz>0:
            eePmap.Fill(ix,iy,c)
            if ix<50:
                eePL.Fill(R,c,1)
            if ix>50:
                eePR.Fill(R,c,1)

        if iz<0:
            eeMmap.Fill(ix,iy,c)
            if ix<50:
                eeML.Fill(R,c,1)
            if ix>50:
                eeMR.Fill(R,c,1)

    prof_eePL = eePL.ProfileX()
    prof_eePR = eePR.ProfileX()
    prof_eeML = eeML.ProfileX()
    prof_eeMR = eeMR.ProfileX()
    
    return ebmap, ebeta, ebphi, eePmap, ebdist, eeMmap, prof_eePL, prof_eePR, prof_eeML, prof_eeMR, ebBorderdist

def EcalCondTools.plot	(		db,
			tag,
			since,
			filename = 'plot.root'
	)

Invoke the plot function from the wrapper and save to the specified \
   file. The file format will reflect the extension given.

Definition at line 64 of file EcalCondTools.py.

References compare(), and harvestTrackValidationPlots.str.

Referenced by EcalCondDB.usage().

def plot (db, tag,since,filename='plot.root'):
    '''Invoke the plot function from the wrapper and save to the specified \
       file. The file format will reflect the extension given.'''
   
    try :
       iov = inspect.Iov(db,tag)
       db.startReadOnlyTransaction()
       Plug = __import__(str(db.payloadModules(tag)[0]))
       payload = Plug.Object(db)
       listOfIovElem= [iovElem for iovElem in db.iov(tag).elements]
       inst = 0
       for elem in db.iov(tag).elements :
           inst = inst + 1
           if str(elem.since())==str(since):
               found = inst
               break
       db.commitTransaction()
       payload = inspect.PayLoad(db, tag, elem)
       payload.plot(filename,"",[],[])
            
    except Exception as er :
        print " plot exception ",er
        

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