Ryan Walker

9 followers -

Engineer, data scientist, blogger

Engineer, data scientist, blogger

9 followers

Posts

Post has attachment

Public

**Rust: Cross compiling from Ubuntu to OS X**

A few months ago, I saw this post by Chris Krycho on Hackernews, which points out just how easy it can be to share Rust binaries with friends. The use case really spoke to me -- I spend a lot of time building prototypes and I often need to share my prototyp...

Add a comment...

Post has attachment

Public

**Analyzing the 2015 California Health Interview Survey in R**

A few years ago, I wrote about how to analyze the 2012 California Health Interview Survey in R . In 2012, plans for Covered California (Obamacare in California) were just beginning to take shape. Today, Covered California is a relatively mature program and ...

Add a comment...

Post has attachment

Public

**Color Quantization in R**

In this post, we'll look at a simple method to identify segments of a region based on RGB color values. The segmentation technique we'll consider is called color quantization . Not surprisingly, this topic lends itself naturally to visualization and R makes...

Add a comment...

Post has attachment

Public

**Building a Streaming Search Platform**

On average, Twitter users worldwide tweet about 6000 tweets per second . Obviously, there is much interest in extracting real-time signal from this rich but noisy stream of data. More generally, there many open and interesting problems in using high-veloci...

Add a comment...

Post has attachment

Public

**Sparse Quadratic Programming with Ipoptr**

This post is a follow up to my last post on quadratic programming facilities in R. A commenter pointed me to the ipoptr project which exposes an R interface to the COIN-OR optimization routine Ipopt . COIN-OR is a suite of optimization utilities implement...

Add a comment...

Post has attachment

Public

**More on Quadratic Progamming in R**

This post is a tour of quadratic programming algorithms and applications in R. First, we look at the quadratic program that lies at the heart of support vector machine (SVM) classification . Then we'll look at a very different quadratic programming demo p...

Add a comment...

Post has attachment

Public

**Voice control your Roku player with Python**

In this post, I describe a simple way to implement a voice controlled Roku streaming player 'remote control' over a telnet connection with Python. The complete code (about 100 lines) is available on github. Roku on Telnet Roku streaming players offer an int...

Add a comment...

Post has attachment

Public

**Analyzing the 2011-2012 California Health Inteview Survey with R**

The California Health Interview Survey (CHIS) is a remarkable biannual survey of health status, care access, and demographics for California residents. The 2011-2012 public use survey data has recently been released and is freely available after registerin...

Add a comment...

Post has attachment

Public

**The Circus Tent Problem with R's Quadprog**

The MathWorks has an interesting demo on how the shape of a circus tent can be modeled as the solution of a quadratic program in MATLAB. In this post, we'll show how to solve this same problem in R using the quadprog package and also provide the technical d...

Add a comment...

Post has attachment

Public

**Going viral with R's igraph package**

R's igraph package provides a simple and flexible set of utilities for working with graphs. In this post, we'll use this package to animate the simulated spread of a disease through a network. Graphs A graph is just a collection of nodes joined by edges: r...

Add a comment...

Wait while more posts are being loaded