Can not plot histogram correctly

I find that when the fill number is big, there is no result, for example

[quote]out_file = root_open(‘plot.root’,‘recreate’)
mh1 = TH1F(‘mh1’,‘mh1’,40,60,200)

for mass in chain_zhh:


to plot a histogram, it’s usually no result( just a blank plot ). It’s wired . Anyone knows the reason?

Can you provide something we can run ?

hi, thanks for your interesting. I then find I need to click my mouse on the plot then it will appear… it’s a stupid problem while I waste much time on it.