# Using R with Slurm

Example script (**hello.R**):
```
sayHello <- function(){
  print("hello")
}
sayHello()
```

User can execute R scripts from the command line with the following commands:

1. R CMD BATCH script.R
2. Rscript script.R

**Note**: With the **R CMD BATCH** command the output of the R script is redirected to file instead of the screen.

Next user must embed the script into the SLURM batch job file/control file (e.g. scriptR.sbatch):

```
#!/bin/bash
#SBATCH --job-name helloworld	# Name for your job
#SBATCH --ntasks 1		# Number of task
#SBATCH --time 5		# Runtime in minutes.
#SBATCH --mem=2000		# Reserve 2 GB RAM for the job
#SBATCH --partition small 	# Partition to submit
#SBATCH --output hello.out	# Standard out goes to this file
#SBATCH --error hello.err	# Standard err goes to this file
#SBATCH --mail-user username@uef.fi	# this is the email you wish to be notified at
#SBATCH --mail-type ALL		# ALL will alert you of job beginning, completion, failure etc

module load r/4.0.0 # load modules

Rscript hello.R # Execute the script

```
The last step is to submit the job to the compute queue with the **[sbatch](https://slurm.schedmd.com/sbatch.html)** command.

```
sbatch scriptR.sbatch
```