∫ntegrabℓε ∂iﬀerentiαℓs · unorganised notes, code, and writings of random topics

Genovese (2001) Interacting Multiple Model Algorithm for Accurate State Estimation of Maneuvering Targets

February 2, 2018 paper

A very short publication introducing the IMM filter. It describes a system with multiple models, and in each model, there is a state. The model transition is a ergodic Markov chain with probability matrix \(\Pi\), and state transition in each mode is a linear dynamic system. The state transition and... [more]

How to calculate percentile

January 26, 2018 blog math

Think about it for a short while, anyone can see that there is no definitive way to define what is a percentile. What is surprising is how many different ways we can define it. [more]

Downsampling algorithms

January 24, 2018 blog code

This is from a master thesis that try to downsample a line chart (time series) but retain all visual characteristics. What I know about downsampling is to assume the input is a signal and pass it through a low-pass filter, as we have learned in the undergraduate signal & system... [more]

Mandelbrot set SQL

using common table expressions in SQLite

January 22, 2018 blog code math

There is a recent change in SQLite documentation, that depicts the use of common table expressions (CTEs) in SQLite to draw a Mandelbrot set using ASCII art: [more]

O-R-I-D focused conversation

January 18, 2018 blog work

Recently I found the ORID conversation method a hot topic in Taiwan. I can even see Audrey Tang (of Perl 6) have a video explaining how she use it in her job in the government. Below are some notes and examples, and all the web resources from which I learned... [more]