cran

I have a bunch of tests that I don't want them running during CRAN checks or Travis CI builds. They are either long-running, or they could cause transaction/concurrency conflicts writing to a networked database. What approach of separating them (from the R CMD check tests) works best with testthat ? Should I put those tests in a separate folder? Should I tag their filename and use a regex? (eg Using filter argument in test_package to skip tests by @Jeroen) http://cran.r-project.org/web/packages/policies.html : Long-running tests and vignette code can be made optional for checking, but do

Using R, I am looking to create a QR code and embed it into an Excel spreadsheet (hundreds of codes and spreadsheets). The obvious way seems to be to create a QR code using the command line, and use the "system" command in R. Does anyone know how to pass R variables through the "system" command? Google is not too helpful as "system" is a bit generic, ?system does not contain any examples of this. Note - I am actually using data matrices rather than QR codes, but using the term "data matrix" in an R question will lead to havoc, so let's talk QR codes instead. :-) system("dmtxwrite my_r_variable

Given 'n' images in a png/jpeg format and 'n' corresponding coordinates in 2 dimensions (x,y): I would like to plot these images at the given coordinates on a single plot. If I find the images to be too big, I would ideally like to plot them as a smaller/scaled version at the given coordinates. How can i achieve such a plot in R? An example of how such a plot would look is given below: xy <- data.frame(x=runif(10, 0, 100), y=runif(10, 0, 100)) require(png) img <- readPNG(system.file("img", "Rlogo.png", package="png")) thumbnails <- function(x, y, images, width = 0.1*diff(range(x)), height = 0

I am looking for a way to change the tempdir() location after an R session has started. I think it would be required to update the C level global variable R_TempDir . What would be a nice way to do this from within R? If you unlock tempdir() and re-assign a new function to the baseenv() it might work: tempdir <- function() "/NewTempDir" unlockBinding("tempdir", baseenv()) assignInNamespace("tempdir", tempdir, ns="base", envir=baseenv()) assign("tempdir", tempdir, baseenv()) lockBinding("tempdir", baseenv()) Update: Simon Urbanecks unixtools package has a function to accomplish this. Below the

My question is similar to a question previously posted but never really answered here: Disable GUI, graphics devices in R I do not like the R tcltk popups for CRAN mirror selection. They also pop up to choose a package when searching for help on a function in two packages. Is there any way to disable these windows without disabling X11 completely? I still want plot() commands to work as normal, but disable the little select menus that take forever to load over a remote connection. For example, if you use ssh, but don't use -X, then the mirror select is just text within R, you type a number. It