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--- software:r:farber [2018-04-26 13:23] – [personal/program specific R libraries and extensions] sraskar
+++ software:r:farber [2019-08-30 15:11] – anita
@@ Line 287: / Line 287: @@
 This script will attempt to build the cuda capable R modules using the
 cuda 6.5 version into ''$WORKDIR/sw/r/add-ons/r3.1.1/testing/default-cuda-6.5''.
+====== R script in batch ======
+==== matmul.R script ====
+Consider the simple R script file to multiply a small 3x3 matrix
+<file R matmul.R>
+# Calculate and print small matrix AA'
+a <- matrix(1:12,3,4);
+a%*%t(a)
+</file>
+Let's test this R script using ''Rscript'' from the command line on a compute node.  Don't forget to set your [[general/userguide/04_compute_environ?&#using-workgroup-and-directories|workgroup]] to define your cluster group or //investing-entity// compute nodes before you use ''qlogin'' to get on a compute node. For example,
+<code bash>
+workgroup -g it_css
+qlogin
+vpkg_require r/3
+Rscript matmul.R
+</code>
+The output to the screen:
+<code>
+     [,1] [,2] [,3]
+[1,]  166  188  210
+[2,]  188  214  240
+[3,]  210  240  270
+</code>
+To return to the head node, type
+<code bash>
+exit
+</code>
+==== matmul.qs file ====
+To run a R script in batch instead of on the command line has nearly the same steps.
+Consider the queue submission script file:
+<file matmul.qs>
+#$ -N matmultiply
+# Add vpkg_require commands after this line:
+vpkg_require r/3
+# Syntax: Rscript [options] filename.R [arguments]
+Rscript matmul.R
+</file>
+Now to run the R script simply submit the job from the head node with the
+''qsub'' command.
+<code>
+qsub matmul.qs
+</code>
+You should see a notification that your job was submitted.  Something like this
+<code bash>
+Your job 2283886 ("matmultiply") has been submitted
+</code>
+After the code completes the output of the script will appear in the file
+''matmultiply.o2283886'' because ''-N matmultiply'' defines the name of the job in ''matmul.qs'' and appears in the notification above as ''("matmultiply")'' with ''2283886'' assigned as the job ID. Type
+<code>
+more matmultiply.o2283886
+</code>
+to display the contents of the output file on the screen.  For example,
+<code>
+Adding dependency `x11/RHEL6.1` to your environment
+Adding package `r/3.0.2` to your environment
+     [,1] [,2] [,3]
+[1,]  166  188  210
+[2,]  188  214  240
+[3,]  210  240  270
+</code>