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Data Science Blog

R Job Scraping and Mapping
7 months ago

R Job Scraping and Mapping

In this post, I’m going to use R to scrape Indeed.com for some jobs, then plot the positions of the top jobs on a map, and save that map to …
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Milepost GIS Location Estimation in R
7 months ago

Milepost GIS Location Estimation in R

I was recently forced at gunpoint to estimate the positions of mileposts along the highways in Maricopa County. This was to estimate stops and arrest positions for law enforcement. Like …
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Comparison of R and Python Parallel Computing in Address Geocoding
7 months ago

Comparison of R and Python Parallel Computing in Address Geocoding

I recently needed to process a bunch of addresses that our proprietary geocoding software was having a problem with. I won’t say the name of the geocoder, but it rhymes …
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R Function to Calculate Bearing Between Two Positions (lat-lon)
7 months ago

R Function to Calculate Bearing Between Two Positions (lat-lon)

An R function I had to write to calculate the true course/bearing between two lat lon positions. Note that the fossil R library has a function called earth.bear to do …
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Hands-On Machine Learning with Scikit-Learn and TensorFlow fix for chapter 3 MNIST dataset

In case you’re using the book in the title, here’s the fix for the Chapter 3 MNIST dataset hang

  1. Download by clicking on the view raw dataset from https://github.com/operalib/operalib/blob/master/mnist/mldata/mnist-original.mat
  2. Use …
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Build your own discrete event simulation framework in Python Part III
10 months ago

Build your own discrete event simulation framework in Python Part III

In Part II, we added a queue and a PatrolCar class to our Python simulation to answer call events in our police patrol simulation. In this installment, we’ll add calls to …
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Build your own discrete event simulation framework in Python Part II
10 months ago

Build your own discrete event simulation framework in Python Part II

In Part I, we learned about creating a simple discrete event simulation controller in Python, using a clock that iterated over a minute counter and translated this minute counter to …
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Build your own discrete event simulation framework in Python Part I
10 months ago

Build your own discrete event simulation framework in Python Part I

The first question you might ask, is why the heck would you build your own simulation framework in Python? There’s a million of them, right?

I wouldn’t say a million. …
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Excel to R Transhipment Problem Optimization Tutorial Part II
10 months ago

Excel to R Transhipment Problem Optimization Tutorial Part II

In this tutorial, I’ll finish the process of converting a simple Excel Transshipment problem that I wrote to minimize the traveling distance that a set of patrol cars would have …
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Excel to R Transhipment Problem Optimization Tutorial Part I
11 months ago

Excel to R Transhipment Problem Optimization Tutorial Part I

In this tutorial I’m going to go through creating an optimization model in Excel. The next part of the tutorial will be scaling a small optimization program into a larger …
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