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

compare()

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 91 of file EcalCondTools.py.

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

compareBarrel()

def EcalCondTools.compareBarrel	(		coeff_barl_1,
			coeff_barl_2
	)

Return an histogram and a map of the differences 

Definition at line 429 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

compareBarrelBorder()

def EcalCondTools.compareBarrelBorder	(		coeff_barl_1,
			coeff_barl_2
	)

Return an histogram and a map of the differences 

Definition at line 454 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 




    

compareEndcap()

def EcalCondTools.compareEndcap	(		coeff_endc_1,
			coeff_endc_2
	)

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

Definition at line 475 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

compareEndcapBorder()

def EcalCondTools.compareEndcapBorder	(		coeff_endc_1,
			coeff_endc_2
	)

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

Definition at line 511 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

dumpXML()

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

Dump record in XML format for a given tag 

Definition at line 44 of file EcalCondTools.py.

References print(), and str.

Referenced by EcalFloatCondObjectContainerXMLTranslator.dumpXML(), EcalCondDB.usage(), EcalTPGCrystalStatusXMLTranslator.writeXML(), EcalTPGLinearizationConstXMLTranslator.writeXML(), EcalTimeBiasCorrectionsXMLTranslator.writeXML(), EcalClusterLocalContCorrXMLTranslator.writeXML(), EcalTPGStripStatusXMLTranslator.writeXML(), EcalTPGTowerStatusXMLTranslator.writeXML(), ESGainXMLTranslator.writeXML(), EcalDAQTowerStatusXMLTranslator.writeXML(), EcalPedestalsXMLTranslator.writeXML(), EcalPulseShapesXMLTranslator.writeXML(), EcalPulseSymmCovariancesXMLTranslator.writeXML(), EcalDCSTowerStatusXMLTranslator.writeXML(), EcalLinearCorrectionsXMLTranslator.writeXML(), EcalChannelStatusXMLTranslator.writeXML(), EcalClusterCrackCorrXMLTranslator.writeXML(), EcalGainRatiosXMLTranslator.writeXML(), EcalAlignmentXMLTranslator.writeXML(), EcalLaserAPDPNRatiosXMLTranslator.writeXML(), EcalClusterEnergyCorrectionObjectSpecificXMLTranslator.writeXML(), EcalWeightGroupXMLTranslator.writeXML(), EcalClusterEnergyCorrectionXMLTranslator.writeXML(), EcalADCToGeVXMLTranslator.writeXML(), EcalTimeOffsetXMLTranslator.writeXML(), EcalTBWeightsXMLTranslator.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(payload, file=out)
      
    except Exception as er :
        print(" dumpXML exception ",er)

getObject()

def EcalCondTools.getObject	(		db,
			tag,
			since
	)

Return payload object for a given iov, tag, db

Definition at line 350 of file EcalCondTools.py.

References print(), and 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)

getToken()

def EcalCondTools.getToken	(		db,
			tag,
			since
	)

Return payload token for a given iov, tag, db

Definition at line 334 of file EcalCondTools.py.

References print(), and str.

Referenced by edmtest::AcquireIntStreamFilter.AcquireIntStreamFilter(), edmtest::AcquireIntStreamProducer.AcquireIntStreamProducer(), and uploadConditions.ConditionsUploader.signIn().

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)

histo()

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

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

Definition at line 237 of file EcalCondTools.py.

References EcalPyUtils.fromXML(), makedist(), print(), and 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()      

listIovs()

def EcalCondTools.listIovs	(		db,
			tag
	)

List all available iovs for a given tag

Definition at line 31 of file EcalCondTools.py.

References print().

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) 

listTags()

def EcalCondTools.listTags

(

db

)

List all available tags for a given db 

Definition at line 20 of file EcalCondTools.py.

References print().

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 ""

makedist()

def EcalCondTools.makedist	(		coeff_barl,
			coeff_endc
	)

Definition at line 377 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

plot()

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 66 of file EcalCondTools.py.

References compare(), print(), and 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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