In this post, I cover how implement a PID controller using a DC power supply and an oscilloscope to generate arbitrary waveforms….
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Programming the DP800 DC Power Supply in Python
This post is a part of a series of posts about instrumentation. Get the full code here. For setup details, see the original post. DC power supplies can be found in all kinds of different laboratory environments. Making supplies programmable improves the reproducibility of experiments. In this post, we will look at various features of…
Creating candlestick charts in Javascript
Introduction In Keynesian economics, price is where supply meets demand. Inefficiencies, such as price differences between markets, means there is no singular price at any given time. Even within markets, price is defined somewhere between bid prices and asking prices. This is best shown with an order book (see below). Here, the solid portion of…
Programming the DS1054Z oscilloscope in Python
This post shows how to program a Rigol DS1000Z series oscilloscope….
How to create a Django project
Web apps have exploded in popularity in recent years. Here is how to create a Django project on Ubuntu as of December 2019….
Check if an item exists in a large set in Python
One way of checking if an item exists in a set is to use Bloom filters. First, import pybloom as follows: from pybloom import BloomFilter……
Applying Base58Check encoding to AES cyphers
Converting binary to string can be useful when you need to represent a number in a recognizable, short package. For this task, Base64 is often used. Base64 contains characters that can be confused with each other. This can lead to transcription mistakes. It is also harder to copy & paste due to special characters. Base58…
Text generation in Python
Text is my personal favorite medium for machine learning. Here is why: In computing, a picture is worth a (few hundred) thousand words. As a result, modeling text is more space and compute efficient than visual models. Text arrived first to the internet. This lead time has resulted in better algorithms, and bottomless data. Interpretability…
Modeling Hawkes Processes in Python
This article has been updated to reflect changes suggested by one of our readers. Thanks Andrew! Full code is at the bottom of the post. New information, released in an instant, can synchronize the behavior of millions of people. This is magnified by the impact of the information, and the transience of its release. Wikipedia…
Modeling Glassdoor job descriptions as a Bag-of-Words
Since the launch of its public beta in 2008, Glassdoor has become the gold standard for company satisfaction ratings. They also have a classifieds section comparable to LinkedIn, Indeed, and others. Glassdoor provides examples of job descriptions with company ratings in context. This makes it easy to compare what good and bad companies have in…