This document captures current best practices for R development, emphasizing modern tidyverse patterns, performance, and style. Last updated: August 2025
| name | HQ City | website | Year Founded | Total Investment Amount | Company Description | |
|---|---|---|---|---|---|---|
| Tegus | Chicago | tegus.co | 2016 | $91,500,000.00 | The Buy Side's Leading Primary Research Platform | |
| Hologram | Chicago | hologram.io | 2014 | $82,353,000.00 | Hologram is a cellular platform designed for the Internet of Things. Thousands of connectivity teams rely on Hologram to keep their fleets connected around the world — from Burbank to Brisbane. Hologram was founded in 2014 by Benjamin Forgan and Patrick Wilbur. Inspired by the connectivity challenges affecting food delivery startups in Singapore, Hologram's co-founders focused their efforts on removing the red tape preventing fast-growing IoT teams from launching cellular equipped fleets around the world. What started as a Kickstarter, under Hologram's old name, Konekt, has blossomed into the de facto networks IoT teams use to launch their products. In the years since Hologram was founded, the company has been a partner to leading technology pioneers around the world. Hologram made it possibl |
| # Byte-compiled / optimized / DLL files | |
| __pycache__/ | |
| *.py[cod] | |
| # C extensions | |
| *.so | |
| # Distribution / packaging | |
| .Python | |
| env/ |
| { | |
| "metadata": { | |
| "name": "Three new matplotlib plots" | |
| }, | |
| "nbformat": 3, | |
| "nbformat_minor": 0, | |
| "worksheets": [ | |
| { | |
| "cells": [ | |
| { |
| // Learn more about F# at http://fsharp.net | |
| // See the 'F# Tutorial' project for more help. | |
| open de.bwaldvogel.liblinear | |
| open java.io | |
| open System | |
| [<EntryPoint>] | |
| let main argv = | |
| let problem = new Problem() | |
| problem.l <- 2 // number of training examples |
Using Python's built-in defaultdict we can easily define a tree data structure:
def tree(): return defaultdict(tree)That's it!