====== R versions ======
===== Docker =====

https://github.com/rocker-org/rocker provides [[:tools:R]] version specific [[:tools:docker]] containers.

===== Rhea =====

On [[admin:it:rhea]], older R versions exist for legacy pipelines and scripts. For example, see ''/opt/ni_tools/R/R-4.4.1/bin'' and packages in ''/opt/ni_tools/Rlib/4.4.1'' (created 2025-08-11 with bump to debian 13/"trixie", R  4.5.1 "Great Square Root").

In a shell script, you can update the PATH to force older R.
<code=bash>
export PATH="/opt/ni_tools/R/R-4.4.1/bin:$PATH" # default to R 4.4.1
</code>

Or call explicitly.
<code=bash>
/opt/ni_tools/R/R-4.4.1/bin/Rscript -e '
       .libPaths("/opt/ni_tools/Rlib/4.4.1");
       print(version$version.string);
       installed.packages()["dplyr",c("Built","Version","LibPath")]
</code>

> <code>
[1] "R version 4.4.1 (2024-06-14)"
                      Built                     Version 
                    "4.4.1"                     "1.1.4" 
                    LibPath 
"/home/ni_tools/Rlib/4.4.1" 
</code>