def pltCitCollab(filename):
####read data from csv file, plot the collaboration-citation data
f1 = open(filename,'r+',encoding='utf-8')
rawdata = csv.reader(f1)
count = sum(1 for row in rawdata)
f1.close()
print(str(count)+' papers analyzed.')
f1 = open(filename,'r+',encoding='utf-8')
rawdata=csv.reader(f1)
data = Analyze.citacollab(rawdata,count)
f1.close()
pyp.plot(data[1],data[0],'ro')
pyp.xlabel('Citations')
pyp.ylabel('Number of co-authors')
pyp.show()
pyp.close()
return data
