Scaling arrays (Changing unit…)

ROOT
1

I’ve got two arrays, on containing some event IDs (events) and the other the event durations (event_durations) measured in [seconds].

I plot them like this (in a python script with pyroot)

I would like to do a conversion from seconds to minutes and I don’t know how to do that in the “ROOT”-way. Could you give me a hint? Should I copy the whole array and rescale it manually? This is kind of awkward… I’m sure there is an elegant solution.

2

If your arrays are numpy arrays, they behave like vectors so that you can do

In [5]: import numpy
In [9]: arr = numpy.asarray([3,4,5,6])

In [10]: arr
Out[10]: array([3, 4, 5, 6])

In [11]: arr*5
Out[11]: array([15, 20, 25, 30])

So you could just do event_durations /= 60.

3

They weren’t, but I’ll do it that way, thanks!

I thought there is maybe a “unit” property or something like that for an axis in a TGraph…