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Bluebill.net

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Site Navigation

 * About
 * Road Conditions

 * GitHub
 * LinkedIn
 * Twitter
 * Mastodon


RECENT POSTS

 * 28 April - Project Pivot Point to Horizontal Line
 * 28 April - Interest Rates - Interesting Properties
 * 01 July - Add Timestamp to Videos
 * 22 May - Python - Loops and Exception Block Else Statements
 * 22 April - Windows Terminal and Cmder


CATEGORIES

 * Article (53)


ARCHIVES

 * 2023 (2)
 * 2022 (4)
 * 2021 (11)
 * 2020 (1)
 * 2018 (5)
 * 2017 (3)
 * 2016 (27)





BLUEBILL.NET#



 * 2023-04-28 - Project Pivot Point to Horizontal Line
   
   Suppose a hole is drilled underground into the back of a drift. The hole is
   drilled from a pivot point at a particular height from the floor. Typically
   this height is a characteristic of the drill. In itself, this is relatively
   moderate and quite standard in underground mining. Sometimes, the drill may
   break down, and they need to use a different drill. Suppose further that the
   alternate drill has a different pivot height from the floor. How can we
   determine where the new pivot point of each hole would be without
   re-designing the pattern? To narrow the scope a little, how can we determine
   the new horizontal distance of the pivot point from the reference line?

 * 2023-04-28 - Interest Rates - Interesting Properties
   
   I was working on some wage modelling in Excel and was looking at multiple
   increases within a given period. I wondered if the result of applying
   individual increases throughout the year is the same as applying the sum of
   the increases to the initial value (Spoiler: it is not). I work the algebra
   to satisfy my curiosity. It isn’t difficult, but it can be a mistake that is
   difficult to detect.

 * 2022-07-01 - Add Timestamp to Videos
   
   I am involved with some experimental work, and a lot of the video footage is
   captured with a GoPro. They are durable and work well in the field.
   Unfortunately, they don’t support timestamp overlay with the date and time on
   the video. I used FFmpeg and a shell script to automate the process. The
   following script will take the video, extract the creation_time tag from the
   video and use that to generate the timestamp overlay.

 * 2022-05-22 - Python - Loops and Exception Block Else Statements
   
   The try/except block has an option else clause. That else clause is executed
   if an exception is not raised in the block. Loops, also have an else clause.
   I never thought that I would actually need to use those and thought they were
   superfluous. Today, I used both. In the following code, I wanted to create a
   folder, but wanted to make sure that I didn’t create a duplicate folder (i.e.
   I didn’t want to write files into the same folder).

 * 2022-04-22 - Windows Terminal and Cmder
   
   Using windows to develop can be a bit of a challenge. It doesn’t have any
   good tools for cross-platform python tools. On Linux, I use make and a
   makefile to orchestrate building and configuring virtual environments. Clone
   the repo and make venv and I have a functional and repeatable environment. A
   few months ago I discovered Cmder. I learned that it has make and most of the
   tools I use out of the box for windows. The only issue, it is a bit of a
   pain. Recently I decided to try installing windows terminal and host Cmder in
   that. That works really well and seems to be pretty stable and is relatively
   easy to install. It would be nicer if it was an automated install, but these
   instructions are not too bad.

 * 2022-02-06 - Uncertainty Propagation in Calculations
   
   In science and engineering, uncertainties and errors are a fact of life. This
   post is a study of how uncertainties can be used in calculations. More
   importantly, this post explores how uncertainty is propagated to subsequent
   calcualtions. That is, given a series of calculations that build on top of
   one another, what happens to the uncertainty.

 * 2021-12-31 - Fuel Tracker
   
   I have written a simple fuel tracker application and you can find it here.
   The idea is a simple system to keep track of fuel records far various
   vehicles I have owned through the years. I have been keeping track of my fuel
   records since 2002 across 4 vehicles. I have over 800 records stored in the
   database. A modest amount, but good information.

 * 2021-12-26 - LED Strip Calculations
   
   The idea is to construct a spiral (Archimedean spiral or others) around a
   right-cone simulating a Christmas tree. We want to model the situation and
   understand how many lights or how long the strip(s) should be to wrap the
   proper amount of loops around the tree. This blog will establish the basic
   model and mathematics. This article will walk you through the mathematical
   derivation and the calculations. The derivations are for completeness. An
   understanding of the process is not required to use the results.

 * 2021-10-02 - Configure Git Bash on Windows to run Make
   
   I have developed a Python template repository that contains a number of
   makefiles for managing repositories. Among the tasks, it can help with
   constructing virtual environments ($ make venv) and installing all pip
   dependencies. It can optionally launch Jupyter notebooks ($ make launch). The
   real power comes from the fact that I can use the same set of commands for
   the basic management of the Python repositories. It is really very handy on
   Linux. I do development work on windows and I wanted to be able to use the
   makefiles there. Unfortunately, there wasn’t an easy way that I really liked.
   There are options like Cygwin and even WSL for Windows. Both of these options
   were too heavy to do what I wanted.

 * 2021-07-24 - Cribbage Strategies Are Explored With New Code And New Methods
   
   This is a rewrite of my previous cribbage article and my article on expected
   average. It also includes access to completely re-written code. The code is
   simplified and complete with unit tests. It uses the click library to drive a
   nice command line/terminal application. This article will assume you are
   familiar with the rules and the point counting conventions of cribbage. Some
   of the relevant counting and conventions will be reviewed.




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