R and packages
==============

You can, or will have to, install complementary packages in R.

First, create a directory (ex: *for R 4.0.4*):

.. code-block:: bash

    mylogin@x5570comp2:~$ mkdir lib_R_4.0.4

Then, edit your ``~/.profile`` to add a line like this:

.. code-block:: bash

    export R_LIBS="/home/mylogin/lib_R_4.0.4":$R_LIBS

.. important:: Yes, you need to change *mylogin* by your login at PSMN, and *lib_R_4.0.4* by the one you've just created.

Source your ``~/.profile`` for it to be taken into account right away (or disconnect/reconnect):

.. code-block:: bash

    source ~/.profile

Verify by loading R, and use ``.libPaths()``:

.. code-block:: R

    mylogin@x5570comp2:~$ R

    R version 4.0.4 (2021-02-15) -- "Lost Library Book"
    [...]

    > .libPaths()
    [1] "/home/mylogin/lib_R_4.0.4"    "/usr/local/lib/R/site-library"
    [3] "/usr/lib/R/site-library"       "/usr/lib/R/library"
    >

Now, you can install packages for R, the usual way, while specifying path:

.. code-block:: R

    install.packages("zoo", lib="/home/mylogin/lib_R_4.0.4")

Same way, personal packages can be used:

.. code-block:: R

    library(zoo)
    # or
    library(zoo, lib.loc="/home/mylogin/lib_R_4.0.4")

Same can be done with group or teams packages (see :doc:`../filesystems/storages`). You can also have multiples directories for different workflows.