class PUtils: public TObject

 Sort in ascending order the first n entries of the array *a.

 Clebsch-Gordan coefficients (arguments are 2x the corresponding j and m)

 3j-symbol, related to Clebsch-Gordan coefficient

 Racah coefficients (arguments are 2 x j or m)

 6j-symbol, related to Racah coefficient

 used by Racah

 return index i of first element a[i] which is larger than r.
 a[] is assumed to be sorted in ascending order

Tokenize the string "options" using
the "delimiter"
(like "+" or ",")
The char array is constructed but never deleted
in addition, any spaces before and after the delimiter are cleaned
-> for setup phase, but not for event loops
The user has to provide the pointer to the char array pointers
with "size", these pointers are updated
In addition, the size is also updated

The ROOT version is buggy:
TString spattern("a - b -> c");
TObjArray *carray = spattern.Tokenize(TString("->"));
carray->GetEntriesFast()
(const Int_t)3

remove matching brackets like a=(, b=)
cout << "in: " << *partc << endl;

We check if "name" is a variable name
or a possible command
Allowed names for variables is alphanumeric + "_"
First char must be alpha or "#"

We check if "name" is an integer variable name

 Samples uniformly between 0 and 1

 Samples from a Gaussian distribution

 Samples from a Poisson distribution

 Samples from a binomial distribution

 Samples from a Breit Wigner distribution

 Sort in ascending order the first (int) entries of the array (Double_t *).
 Adapted from Ref 1

 (-1)**n