How to find out which package version is loaded in R?

Question

I am in the process of figuring out how to use my university cluster. It has 2 versions of R installed. System-wide R 2.11 (Debian 6.0) and R 2.14.2 in a non-standard location.

I am trying to use MPI together with snow. The code I am trying to run is the following

library(snow)

library(Rmpi)

cl <- makeMPIcluster(mpi.universe.size()-1)

stopCluster(cl)

mpi.quit()

It works without the problems on R 2.11. (I launch the script with mpirun -H localhost,n1,n2,n3,n4 -n 1 R --slave -f code.R). Now when I try to do it with R 2.14.2, I get the following message:

Error: This is R 2.11.1, package 'snow' needs >= 2.12.1

In addition: Warning message:

So it seems that R loads the package snow version compiled for R 2.11. I've installed snow under R 2.14 into my home folder and I added the following lines to my code:

libPaths("/soft/R/lib/R/library")

.libPaths("~/R/x86_64-pc-linux-gnu-library/2.11")

print(.libPaths())

print(sessionInfo())

print(version)

And the output before the error confirms that I am indeed running R 2.14.2 and my R packages folder is first in the search path. But I still get the error.

So my question is how do I determine which version of the package is loaded in R? I can see with installed. packages all the packages that are installed, so maybe there is some function that lists similar information for loaded packages?

Answer 1

You can use the packageVersion() function to print version information about the loaded packages.

For example:

packageVersion('ggplot2')

Output:

[1] ‘3.2.0’

To print the version information about R, the OS and attached or loaded packages, use the sessionInfo() function.

sessionInfo()