Merging several RooDataSets

[mark1]

Hi,

suppose I have several RooDataSets, that are stored in a list bkgperCat:

bkgperCat=[]
    while obj:
        objName=obj.GetName()
        catName=objName.replace('Nbkg_','')
        redData=data.reduce(ROOT.RooFit.Cut('sample==sample::%s'%catName))             
        bkgperCat.append( ROOT.RooDataSet('bkg'+catName, 'bkg '+catName,   redData, redData.get(), '', objName+'_sw') )
        obj = iterator.Next()

and now I want to add several RooDataSet stored in bkgperCat in one single Dataset. I tried:

bkg_inclusive=ROOT.RooDataSet() 
for i in xrange(0,len(bkgperCat)):

        bkg_inclusive.append(bkgperCat[i])

in order to add all in one dataset bkg_inclusive. However this does not work… What is the easiest way to do this? Thanks!

[moneta]

Hi,

Using append it should work if the data set share the same observables.
If not, please post a running script or open a JIRA ticket

Lorenzo