TH2::GetStats

ROOT
1

Hi,
I am trying to figure out how to get the statistics of a 2d histogram.
Using:
stats = (0.,1.,2.,3.,4.,5.,6.)
h2.GetStats(stats)
gives error message "TypeError: void TH2::GetStats(Stat_t* stats) => could not convert argument 1

If anybody could help ?

Cheers Thomas

2

With normal CINT or C++, this is absolutly trivial, just do
double stats[7]
h2.GetStats(stats)

Since you post this question in the Python thread, I assume that the problem
is with the python interface. In this case, Wim will process your mail

Rene

3

Hi Thomas,

a tuple can not act as a placeholder like a C++ builtin array can, because it is immutable as per the python language reference. Instead, do simply:

from array import array stats = array( 'd', 7*[0.] ) # creates a mutable buffer of 7 doubles h.GetStats ( stats )
HTH,
Wim