I agree with Romain that you should probably try and get Rserve to work as
that is a much better way. However, to get your commandline version working,
I suggest you use the Rscript comman instead of a bash script. So let's say
you save your R script as a myscript.R file. Then do:
shell_exec('Rscript /path/to/myscript.R'." 2>&1");
If that still gives you an error like Rscript command not found, then you
need to make sure your R bin directory is added to the PATH system variable.
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