On 27/06/2014, 4:08 AM, Benjamin Tyner wrote: > Hi > > I know that subset() is not intended for use in programming. However I > am still curious to learn why, in non-interactive mode, if I take away > the quotes around 'bar' > > Rscript -e "foo <- list(bar = iris); head(subset(foo$'bar', > Species=='setosa'))" > Sepal.Length Sepal.Width Petal.Length Petal.Width Species > 1 5.1 3.5 1.4 0.2 setosa > 2 4.9 3.0 1.4 0.2 setosa > 3 4.7 3.2 1.3 0.2 setosa > 4 4.6 3.1 1.5 0.2 setosa > 5 5.0 3.6 1.4 0.2 setosa > 6 5.4 3.9 1.7 0.4 setosa > > then it results in an error: > > Rscript -e "foo <- list(bar = iris); head(subset(foo$bar, > Species=='setosa'))" > Error in subset.default(foo, Species == "setosa") : > object 'Species' not found > Calls: head -> subset -> subset.default > Execution halted > > and also why this does not occur in interactive mode? My sessionInfo() is > > R Under development (unstable) (2014-06-26 r66043) > Platform: x86_64-unknown-linux-gnu (64-bit) > > locale: > [1] LC_CTYPE=en_US.UTF-8 LC_NUMERIC=C > [3] LC_TIME=en_US.UTF-8 LC_COLLATE=en_US.UTF-8 > [5] LC_MONETARY=en_US.UTF-8 LC_MESSAGES=en_US.UTF-8 > [7] LC_PAPER=en_US.UTF-8 LC_NAME=C > [9] LC_ADDRESS=C LC_TELEPHONE=C > [11] LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C > > attached base packages: > [1] stats graphics grDevices utils datasets methods base >
Try replacing "Rscript -e" with "echo" to see what your shell is really sending as a command to execute. I suspect it is treating $bar as a shell variable (see the error message, it has disappeared). ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
