R Plotting: Enabling X11 Support on the Cluster
R is compiled with X11 support on the HPCC cluster servers. To run an R script that saves plots using the following functions: jpeg(), png(), tiff(), or bmp(), add the header line #SBATCH --x11 in your SLURM job script. Otherwise, you'll get the error message: "unable to open connection to X11 display." If plots will be saved as pdf files, then this header line is not needed.
For more information about using R on the HPCC, please see https://wiki.hpcc.msu.edu/x/roFaAQ
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