mathematics

If the underlying TChain has no name (""), then the output of SaveGraph is far from helpful.
The following script:

#include<ROOT/RDataFrame.hxx>
#include<ROOT/RDFHelpers.hxx>
#include<TSystem.h>

using namespace ROOT;

int main(){
  ROOT::RDataFrame(1).Define("x", "42").Snapshot("t", "f.root");

  TChain ch("");
  ch.Add("f.root?#t");
  RDataFrame df(ch);
  auto df2 = df.Coun

IEEE 754 recommends (but does not require) a compound function, which is in the process of being standardized for C and C++; we should expose it in swift-numerics. The simplest, most literal translation of the operation into Swift would be:

extension RealFunctions {
  /// (1+x)ⁿ
  /// 
  /// Returns NaN if x < -1.
  static func compound(_ x: Self, _ n: Int) -> Self {
    // not

The current example program for RNGs is trivial, and only shows how to set a seed. We need a more elaborate example that shows how to initialize a new RNG, how to use it to generate random numbers, and how to set it as the default.