C++ is dead. Long live C++

December 1, 2011 | Dzidorius Martinaitis

During the summer I was contacted by a hedge fund from Bahamas. The fund was looking for someone with R language skills on-site and insisted for phone interview. Besides obvious questions about finance, statistics, coding and how many tennis balls can fit in Boeing 747 (ok, this question was omitted), they ... [Read more...]

Connect JAVA to R part 2

September 29, 2011 | George

To follow on from the earlier post on using R through Java, it is even easier to get jri up and running as a NetBeans module. Why is this useful? Well the platform that the NetBeans IDE is built on … Continue reading → [Read more...]

Using jri to connect JAVA to R

September 19, 2011 | George

The R package rJava allows R to be accessed in Java programs. The part of the package that allows this is jri. The notes on the rJava site about getting jri to work didn’t help me much getting it to … Continue reading → [Read more...]

Programmers Should Know R

August 6, 2011 | John Mount

Programmers should definitely know how to use R. I don’t mean they should switch from their current language to R, but they should think of R as a handy tool during development.Again and again I find myself working with Java code like the following. td.linenos { background-color: #f0... [Read more...]

Software tools for data analysis – an overview

February 19, 2011 | Szilard

by Szilard Pafka Discussions on various software tools (C, C++, Perl, Python, Unix shell, R, Matlab, SAS, SPSS, Excel, databases, Hadoop etc.) used in data analysis. Szilard Pafka (founder and co-organizer of the Los Angeles R users group) presents an … Continue reading →
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Tick data retrieval

January 31, 2011 | Dzidorius Martinaitis

I just published Java based code to pull tick data from Interactive Brokers. There are thousands tools to get tick data from IB, but I had one feature in mind. You can get maximum 50 quotes per second from Interactive Brokers (its IB limitation for TWS API) . Imagine a situation, when ... [Read more...]

raster images and RImageJ

February 18, 2010 | romain francois

The next version of R includes support for raster images in standard and grid graphics. The RImageJ package uses ImageJ through rJava to read and manipulate images from various formats Paul Murrell closed the gap and contributed code that allows...
[Read more...]

Top Five Open Source Projects of 2009

November 5, 2009 | Ed Borasky

Every year, I single out what I think are the Top Five open source projects. This year, there's only one hold-over from previous years, and it's likely that I'm just going to give it a Lifetime Achievement Award and pick five others next year. 5. NetBe... [Read more...]

new R package : ant

September 8, 2009 | romain francois

The ant package has been released to CRAN yesterday. As discussed in previous posts in this blog (here and here), the ant R package provides an R-aware version of the ant build tool from the apache project. The package contains an R script that c... [Read more...]

update on the ant package

September 3, 2009 | romain francois

I have updated the ant package I described yesterday in this blog to add several things Now the R code related to and tasks can either be given as the code attribute or as the text inside the task The R code has acces... [Read more...]

R capable version of ant

September 2, 2009 | romain francois

ant is an amazing build tool. I have been using ant for some time to build the java code that lives inside the src directories of my R packages, see this post for example. The drawbacks of this approach are : that it assumes ant is available on... [Read more...]

Tip: get java home from R with rJava

September 2, 2009 | romain francois

Assuming rJava is installed and works, it is possible to take advantage of its magic to get the path where java is installed: $ Rscript --default-packages="methods,rJava" -e ".jinit(); .jcall( 'java/lang/System', 'S', 'getProperty', 'java.home' )... [Read more...]

Combine R CMD build and junit

August 28, 2009 | romain francois

This is a post in the series Mixing R CMD build and ant. Previous posts have shown how to compile the java code that lives in the src directory of a package and how to document this code using javadoc. This post tackles the problem of unit testin... [Read more...]

Completion for java objects

August 9, 2009 | romain francois

As indicated in this thread, completion after the dollar operator can be customized by defining a custom names method. Here I am showing how to take advantage of this to display fields and methods of java references (jobjRef objects from the rJava ... [Read more...]

Rails, Scalability and Sexism

April 29, 2009 | Ed Borasky

It’s been a long time since I posted here, for a number of reasons: Change of focus from Ruby programming to Linux capacity planning, especially in the realm of I/O subsystems. You’ll find more about that at [Read more...]

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