Here’s a deceptively simple riddle for you:
Using the numbers 1, 3, 4, 6 exactly once each, and any combination of +, -, *, /, plus parenthesis if you need to, try to arrive at the number: 24.
Give it a try. If you find the solution, I applaud you! (I could’t).
If you don’t (or if like to read recursive algorithms), you can find a solution in R here, where I use the superb data.tree package to do a brute-force random search.
I finally signed the lease for my future apartment. Now it’s time to see whether my new neighborhood is safe or not !
Check out the code to create the map above here.
The 4 red neighborhoods are:
- 23: Hochelaga-Maisonneuve
- 26: Côte-des-Neiges
- 38: Le Plateau-Mont-Royal partie sud
- 44: Rosemont et La Petite-Patrie
Oh and in case you’re wondering…my neighborhood is “Very low risk” 🙂
Whenever I form the unfortunate idea to invest in the stock market, I first start by playing with the google finance stock screener.
This time, instead of burning my money, i thought my time would be better spent building a stock screener of my own.
The step-by-step code is here:
The result is data frame that looks like this:
For an example of visualization:
In the above plot, I’ve removed outliers and displayed some stock symbols in the north-west corner, i.e. stocks with low Price/Earnings ratio and high BookValue/Price ratio.
After hearing Donald Trump repeat ad nauseam that “We [the U.S.] are losing in trade to China, losing to Mexico…”, I decide to check for myself !
- U.S. exports to China have been steadily increasing for the last 15 years, but the imports from China have sky-rocketed during the same period.
- Trade balance with Mexico has actually been pretty stable for the last 10 years.
- Among the top-8 commercial partners, Canada is the 1st importer of U.S. goods. Mexico is second, China is third.
- Exchanges with Canada have dropped sharply in 2015.