Articles by Yixuan's Blog - R

Large scale eigenvalue decomposition and SVD with rARPACK

February 21, 2016 | Yixuan's Blog - R

In January 2016, I was honored to receive an “Honorable Mention” of the John Chambers Award 2016. This article was written for R-bloggers, whose builder, Tal Galili, kindly invited me to write an introduction to the rARPACK package. A Short Story of rARPACK Eigenvalue decomposition is a commonly used technique in numerous ... [Read more...]

Using showtext in knitr

July 20, 2014 | Yixuan's Blog - R

Thanks to the issue report by yufree and Yihui’s kind work, from version 1.6.10 (development version), knitr starts to support using showtext to change fonts in R plots. To demonstrate its usage, this document itself serves as an example. (Rmd source code) We first do some setup work, mainly about ... [Read more...]

Using system fonts in R graphs

December 31, 2013 | Yixuan's Blog - R

This is a pretty old topic in R graphics. A classical article in R NEWS, Non-standard fonts in PostScript and PDF graphics, describes how to use and embed system fonts in the PDF/PostScript device. More recently, Winston Chang developed the extrafont package, which makes the procedure much easier. A ... [Read more...]

A Conversation with Hadley Wickham

September 26, 2013 | Yixuan's Blog - R

Dr. Hadley Wickham is the Chief Scientist of RStudio and Assistant Professor of Statistics at Rice University. He is the developer of the famous R package ggplot2 for data visualization and the author of many other widely used packages like plyr and reshape2. On Sep 13, 2013 he gave a talk at ... [Read more...]

Handwriting recognition using R

December 17, 2011 | Yixuan's Blog - R

This title is a bit exaggerating since handwriting recognition is an advanced topic in machine learning involving complex techniques and algorithms. In this blog I’ll show you a simple demo illustrating how to recognize a single number (0 ~ 9) using R. The overall process is that, you draw a number in ... [Read more...]

How to run regression on large datasets in R

October 1, 2011 | Yixuan's Blog - R

It’s well known that R is a memory based software, meaning that datasets must be copied into memory before being manipulated. For small or medium scale datasets, this doesn’t cause any troubles. However, when you need to deal with larger ones, for instance, financial time series or log ... [Read more...]

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