Error using SetDirectory

Newbie
1

I’m getting this error when I try to run a python plotting script:

AttributeError: 'TObject' object has no attribute 'SetDirectory'

Here is the part of the script for fetching the histograms / where I’m getting the error:

fileName1 = "20200311_histos.root"
variable1 = "recpt"
file1 = ROOT.TFile.Open(fileName1,"READ")
h1 = file1.Get(variable1)
h1.SetDirectory(0)
if (file1.IsOpen()):
    file1.Close()

and the lines used for fetching python / importing ROOT:

#!usr/bin/env python
import os
import sys
import numpy as np
import math
from array import array
import ROOT

(I installed ROOT with homebrew.)

Does anyone know how to solve this?

2

It is true that TObject does not have a SetDirectory method. It looks like your object h1 is considered as a TObject it should be a TH1. (@etejedor ?)

3

Hi,

I believe the problem is that the histogram is not retrieved correctly from the file, at this line:

h1 = file1.Get(variable1)

Can you double check that “recpt” exists in the file? You can do file1->ls().