4342 search results for "git"

Milano (Italy). April 18, 2013. Third Milano R net meeting: agenda

April 10, 2013
By
Milano (Italy). April 18, 2013. Third Milano R net meeting: agenda

April 18, 2013 - 18:00 - 21:00 Fiori Oscuri Bistrot & Bar (www.fiorioscuri.it) Via Fiori Oscuri, 3 - Milano (Zona Brera) 18.00 - 18.15 Registration 18.15 - 18.30 Welcome presentation Andrea Spanò, Partner at Quantide 18.30 - 19.00 Digit recognition Machine … Continue reading →

Read more »

Some R User Group Presentations from Europe

April 9, 2013
By

by Joseph Rickert I am beginning to get excited about going to Spain for useR 2013 which will be held at the University of Castilla-La Mancha, so I have been using the links on the Revolution's local user directory webpage to see what the European R user groups are doing. Here are just a few highlights of materials that...

Read more »

Behind the NCAA Visualizer: Python, R and JavaScript

April 9, 2013
By

Rodrigo Zamith's NCAA Tournament Visualizer is a great example of an interactive data visualization. If you want to create something similar, Rodrigo has shared detailed behind-the-scenes information on how it was created. He used a mix of tools: Python was used to scrape team statistics fromt the NCAA website R was used to prepare the data for analysis, and...

Read more »

Matrix Cumulative Coherence: Fourier Bases, Random and Sensing Matrices

April 9, 2013
By

Compressive sampling (CS) is revolutionizing the way we process analog to digital conversion, our understanding of linear systems and the limits of information theory. One of the key concept in CS is that a signal can be represented in a sparse bases o...

Read more »

Changing figure options mid-chunk (in a loop) using the pander package.

April 9, 2013
By
Changing figure options mid-chunk (in a loop) using the pander package.

I wrote already about changing figure options mid-chunk in reproducible research. This can be important  e.g. if you are looping through a dataset to produce a graphic for each variable but the figure width or height need to depend on properties of the variables, e.g. if you are producing histograms and want the figures to

Read more »

Package-Wide Variables/Cache in R Packages

April 8, 2013
By

It’s often beneficial to have a variable shared between all the functions in an R package. One obvious example would be the maintenance of a package-wide cache for all of your functions. I’ve encountered this situation multiple times and always forget at least one important step in the process, so I thought I’d document it

Read more »

Instructions for Installing & Using R on Amazon EC2

April 8, 2013
By

If you’re an R user, you’ve surely heard all the hype around ‘big data’ and how R is commonly used to analyze these volumes of data. One thing that’s often missing from the discussion is HOW to work around issues using big data and R, specifically how to deal with the fact that R stores Instructions for Installing...

Read more »

Use foursquare to locate a twitter user using R

April 8, 2013
By
Use foursquare to locate a twitter user using R

I've been doing some work with Twitter data. In much of this work, my life would be so much easier if we could geographically locate the origin of the tweets. There are some ways to do this using the twitter APIs. For example, if a user has geo-locatio...

Read more »

Visualize large data sets with the bigvis package

April 8, 2013
By
Visualize large data sets with the bigvis package

Creating visualizations of large data sets is a tough problem: with a limited number of pixels available on the screen (or just with the limited visual acuity of the human eye), massive numbers of symbols on the page can easily result in an uninterpretable mess. On Friday we shared one way of tackling the problem using Revolution R Enterprise:...

Read more »

Dynamic Wrapping and Recursion with Rcpp

April 8, 2013
By
Dynamic Wrapping and Recursion with Rcpp

We can leverage small parts of the R’s C API in order to infer the type of objects directly at the run-time of a function call, and use this information to dynamically wrap objects as needed. We’ll also present an example of recursing through a list. To get a basic familiarity with the main functions exported from R API, I...

Read more »