I recently started reading a very interesting book called [The Elements of Computing Systems][nand2tetris] by Noam Nisan and Shimon Schocken. The book is nicknamed “nand2tetris”, so called because the reader starts off with a NAND gate and using it as a building block for more complex systems builds a…
Last week I started playing around with the [Instaparse][instaparse] library, which makes writing parsers really easy in Clojure. What Instaparse does is take the formal definition of a language and give you a parser for that language. You can then use that parser on a string, possibly containing something…
One of the classical problems in Natural Language Processing is parts-of-speech tagging i.e. given a sentence of length n, find the sequence of part-of-speech tags for each word in the sentence. For example, $$\text{POS(“the”,”man”,”walks”) = (“article”,”noun”,”verb”)}$$ There are several approaches to parts-of-speech tagging, and…
I recently found myself having to play around with some stock exchange data. The stock exchange in Nepal, unsurprisingly, doesn't provide a data API so I had to scrape their website. The non-realtime data isn't very interesting, just regular old scraping made a little more tedious…
Table of Contents * 1. A (fake) realtime happiness gauge * 2. Project setup * 3. Websocket server * 4. Front end Websocket is a relatively new network protocol that enables a connection between client and server to have long-living connections. What this means is that servers can push things to clients and vice-versa…
In my previous post, I gave a pretty quick introduction to Clojurescript. If you haven’t already, I recommend you read through that post. This post assumes that you have some Clojure knowledge and already have Leiningen running. In this post, I’ll show how to create a SQL database-backed…
There doesn’t seem to be much written about running Clojurescript, especially considering how great a tool it really is. I know there is a book that’s coming out soon, but I had some trouble getting started with Clojurescript so I decided to put together this post, that hopefully…
A while back, I came upon this problem: “You need to kill an N-headed monster. To do that, you have two swords. The first sword(A) cuts cutA heads, however, in case the monster doesn’t die(ie no. of heads > 0), it will grow growA heads. The second…