r - Can't pass two numerical arguments with docopt package -

in creating command line tool using r, decided use docopt package. works passing flags, can't figure out how pass 2 numeric values. see below code:

#! /usr/bin/rscript  'usage: ./test.r [-lr <low> -hr <high>]  options:  -h --help         shows screen  -lr --low <low>         passes low risk investiment  -hr --high <high>        passes high risk investiment' -> doc  library(docopt) # retrieve command-line arguments opts <- docopt(doc) # options? note stripped versions of parameters added returned list cat(opts$high) cat(opts$low) str(opts)  

whenever try run using ./test.r -lr 2000 -hr 4000 warns me methods package being loaded , returns nothing else.

• what mistake here?

first, -h specified twice: once "help", "high", you'll run problems there. fix this, i'll use upper-case letters short arguments. second, argument option must either in <angular-brackets> or upper-case, -lr doesn't work. (apparently needs space between option , argument.) i'll expand same named arguments long options.

additionally (though perhaps not strictly required), think comma helps clarify things. (edit: apparently docopt.r doesn't leading ./ on usage, i've updated output.)

usage: test.r [-l <low> -h <high>]  options:  -h, --help                 shows screen  -l <low>, --low <low>     passes low risk investiment  -h <high>, --high <high>  passes high risk investiment 

(i found requirements docopt @ http://docopt.org/. found interactive docopt demo worked quite well, too.)