[R] output usage info to stdout

From: Hui Du <Hui.Du_at_dataventures.com>
Date: Wed, 20 Apr 2011 14:40:59 -0400

Hi all,

                I want to run a R code in the batch mode under UNIX system. Inside that code, I have a usage() function to give the hints regarding parameters. For example
usage = function()

    msg = "R CMD BATCH --save \"--args path=\\\"input_path\\\" file=\\\"input_file\\\" [seed=\\\"integer\\\" proportion=\\\"[0-1]\\\" outpath=\\\"output_path\\\" outfile=\\\"output_file\\\"]\" /S/hxd/utils/sampleRecords.r.txt";    print(msg);

                When I run the code like

R CMD BATCH mycode.R, I want to output the usage info if the required parameters are not there. But how to output the usage info listed above to standard out rather than to a file?


HXD         [[alternative HTML version deleted]]

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