cygnyx

Dec 26, 2023 HTML, JSON
Copy a Webpage to JSON
Bookmarklets have been around for a long time. The concept is to attached some Javascript code in a bookmark. Over the years this process has changed. The tricky bit is to copy the link into an existing bookmark. So, for example, you can make a bookmark for this page, then in your browser edit the bookmark with a name like Convert a Webpage to JSON. Then copy the address of the link below called Convert this page to JSON and paste it into the Bookmark link. After running this bookmarklet inspect the result using JSONpath or similar online JSON parser. If you use JSONpath with the output from the link below, try a path like $..MAIN..UL[*].LI.
Apr 28, 2019 AWS
AWS configuration
AWS - Amazon Web Services
Nov 1, 2018 algorithms reference ANN vision
ANN References
Artifical Neural Network References.
Jun 29, 2018 algorithms QP python C java javascript
qppenalty
This notebook implements qppenalty: a program that solves quadratic programming problems.
May 22, 2018 tensorflow ANN
Two Input Classifier
This notebook demonstrates the need for multi-layer ANN when the solution involves fitting many non-linear edges.
May 21, 2018 tensorflow timing
Noise and Batch Size in Linear Regression
Using a linear regression, I find that a batch size of 32 or larger works best in tensorflow.
May 20, 2018 tensorflow algorithms QP
TF Quadratic Programming
Using a penalty function technique, I used TensorFlow to solve constrained quadratic programming problems.
May 20, 2018 python numpy numexpr timing
Numeric Calculation Timing
Comparison of python, numpy and numexpr performance.
May 3, 2018 tensorflow ANN algorithms
Reverse mode Automatic Differentiation
TensorFlow uses a computational graph because it uses a Reverse mode Automatic Differentiation algorithm.
Apr 12, 2018 pointset Delaunay tensorflow ANN
Emulating qtest with an ANN
I found that the qtest used in a Delaunay triangulation algorithm was difficult to emulate with an ANN.
Apr 2, 2018 pointset Delaunay Voronoi Thiessen quad-edge
pointset class for Delaunay triangulation
The pointset class provides a framework for studying Delaunay triangulations.
Apr 1, 2018 quick select algorithms
Quickselect Performance
Turns out that select is much faster than sort algorithms for calculating the median of a data set.
Mar 21, 2018 github jekyll
Minima theme change problem
While trying to update my GitHub site, I got an error about a symbolic link being missing in my default.html. This was strange since I didn’t have a default.html file. The problem was a recent update to the Minima theme which the site uses.
Mar 20, 2018 cloudant smileupps.com
IBM Changes Cloudant, Smileupps.com
IBM has taken over Cloudant which I had been using as a live site for pry, so I needed to move the site.
Feb 20, 2018 finance quandl holidays
Holidays from Quadl Prices
A Jupyter notebook for calculating non-tradedays based on Quadl prices.
Feb 19, 2018 finance
Plot of Dow Component performance
A Jupyter notebook for plotting Dow Component performance.
Feb 14, 2018 ANN tensorflow
Modeling Binary and Unary Operators with an Artifical Neural Network
To develop an understanding of tensorflow’s ANN I implemented regression models of several unary and binary functions.
Jan 19, 2018 github jekyll
jekyll problems
My local installation of bundle and jekyll became corrupted.
Jan 19, 2018 development gzip iphone
gzip on the iphone
Before sending out some data from the iphone, I wanted to compress it in a well known format. I didn’t find a simple solution to this, so I wrote this function:
Jan 17, 2018 cfa finance
CFA FinTech Machine Learning Talk
Sanjiv Ranjan Das srdas spoke on the use of machine learning and other artifical intelligence techniques in financial services.
Jul 25, 2017 yahoo finance
Yahoo Financial Historical Prices
I created a Jupyter notebook for downloading AAPL historical prices due to recent changes in the Yahoo Finance website. The notebook can be download here or viewed online at GitHub.
May 15, 2017 github jekyll
Jekyll sitemap and seo plugins
I read that GitHub has some support for Jekyll plugins. With some difficulty I added the sitemap plugin that is supported.
May 12, 2017 github jekyll
Reducing GitHub commits
In order to test functionality of GitHub, I’ve had to make many commits and pushes onto GitHub. After making adjustments I didn’t need this multitude of commits.
May 12, 2017 development
gdb on MacOS
I was surprised to find that my Mac OS included gcc but not gdb. Getting gdb working is non-trivial. This article was helpful in getting this to work after: brew install gdb
May 2, 2017 github jekyll
Using Jekyll to Deploy to GitHub
I’ve tried a few static site builder with GitHub pages, such as brunch and Metalsmith. Since Jekyll is popular and is recommended for GitHub, I’ve decided to give it a try.