In the R parallel package, there are two implementations of parallelism, e.g. fork and socket, with pros and cons. For the fork, each parallel thread is a complete duplication of the master process with the shared environment, including objects or variables defined prior to the kickoff of parallel threads. ... [Read more...]

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The problem I have a package called strex which is for string manipulation. In this package, I want to take advantage of the regex capabilities of C++11. The reason for this is that in strex, I find myself needing to do a calculation like

x <- list(c("1,000", "2,000,000"),
          c("1", "50", "3,455"))
lapply(x, function(x) as.numeric(stringr::str_replace_all(x, ",", "")))
#> [[1]]
#> [1] 1e+03 2e+06
#> 
#> [[2]]
#> [1]    1   50 3455

A lapply like this can ... [Read more...]

very brief intro notes - I like dplyr I’ve used data.table in the past, though didn’t persevere with it enough. My happy safe space is dplyr & ggplot2. I love these packages and use them almost every time I use R. Every so often , I s... [Read more...]

very brief intro notes - I like dplyr I’ve used data.table in the past, though didn’t persevere with it enough. My happy safe space is dplyr & ggplot2. I love these packages and use them almost every time I use R. Every so often , ... [Read more...]

very brief intro notes - I like dplyr I’ve used data.table in the past, though didn’t persevere with it enough. My happy safe space is dplyr & ggplot2. I love these packages and use them almost every time I use R. Every so often , ... [Read more...]

Note: Crossposted by Ivan, James and myself. Today Dirk Eddelbuettel, James Balamuta and Ivan Pavlov are happy to announce the first release of a reworked R interface to the Vowpal Wabbit machine learning system. Started as a GSoC 2018 project, the new rvw package was built to give R users easier ... [Read more...]

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My favorite R data.table feature is the “by” grouping notation when combined with the := notation. Let’s take a look at this powerful notation. First, let’s build an example data.frame. d [Read more...]

rvw 0.6.0: First release rvw 0.6.0: First release Note: Crossposted by Ivan, James and myself. Today Dirk Eddelbuettel, James Balamuta and Ivan Pavlov are happy to announce the first release of a reworked R interface to the Vowpal Wabbit machine learning system. Started as a GSoC 2018 project, the new rvw package was ... [Read more...]

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Version 0.3.2 of psychonetrics is now on CRAN! This means that the package can now be installed easily from R and that the automatically generated manual is online. For more notes on how to install psychonetrics, please see the installation guide on this website. Note that this page also explains how ... [Read more...]

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Writing functions that take data frame columns as arguments is a problem that most R users have been confronted with at some point. There are different ways to tackle this issue, and this blog post will focus on the solution provided by the latest release of the {rlang} package. You ... [Read more...]

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I recently came across the article “How Mapping Shots In The NBA Changed It Forever” and although I am not a big basketball fan, I was impressed by the visualizations. I actually bought the book “Sprawlball” by Kirk Goldsberry afterwards, where this was taken from. I can only recommend it, ... [Read more...]

The r-project.org domain had some temporary technical difficulties this week (2019-29) that made reaching R-related resources problematic for a bunch of folks for a period of time. Incidents like this underscore the need for regional and network diversity when it comes to ensuring the availability of DNS services. That ... [Read more...]