mathematics

What about create a design pattern directory with the most popular design patterns examples?
We can create some rules like: have to be an explanation about the design pattern, the structure and one real world example.
The directory can be:

(folder) Design Patterns
-- (folder) Abstract Factory
-- -- AbstractFactory.js
-- -- AbstractFactoryTest.js
-- -- REAME.md

I can send some :

Current behavior:

root [0] TFile f("root://eospublic.cern.ch//eos/root-eos/benchmark/Run2012B_SingleMu.root")
Error in <TFile::TFile>: file /eos/root-eos/benchmark/Run2012B_SingleMu.root does not exist
(TFile &) Name: /eos/root-eos/benchmark/Run2012B_SingleMu.root Title:

Desirable behavior:

root [0] TFile f("root://eospublic.cern.ch//eos/root-eos/benchmark/Run2012B_Single

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

What is the feature or improvement you would like to see?

A function that computes the graph center, and the graph periphery. The graph center is the set of vertices that has minimal eccentricity. The periphery is the set with maximal eccentricity.

Use cases for the feature

This is a standard concept in graph theory.

**Implementatio