Where does r studio install packages/libraries?
As a newbie to R I wanted to look at the source code of some of the libraries/packages that I’d installed via R Studio which I initially struggled to do as I wasn’t sure where the packages had been installed.
I eventually came across a StackOverflow post which described the http://stat.ethz.ch/R-manual/R-devel/library/base/html/libPaths.html function which tells us where that is:
> .libPaths()
[1] "/Library/Frameworks/R.framework/Versions/3.1/Resources/library"If we want to see which libraries are installed we can use the http://stat.ethz.ch/R-manual/R-devel/library/base/html/list.files.html function:
> list.files("/Library/Frameworks/R.framework/Versions/3.1/Resources/library")
[1] "alr3" "assertthat" "base" "bitops" "boot" "brew"
[7] "car" "class" "cluster" "codetools" "colorspace" "compiler"
[13] "data.table" "datasets" "devtools" "dichromat" "digest" "dplyr"
[19] "evaluate" "foreign" "formatR" "Formula" "gclus" "ggplot2"
[25] "graphics" "grDevices" "grid" "gridExtra" "gtable" "hflights"
[31] "highr" "Hmisc" "httr" "KernSmooth" "knitr" "labeling"
[37] "Lahman" "lattice" "latticeExtra" "magrittr" "manipulate" "markdown"
[43] "MASS" "Matrix" "memoise" "methods" "mgcv" "mime"
[49] "munsell" "nlme" "nnet" "openintro" "parallel" "plotrix"
[55] "plyr" "proto" "RColorBrewer" "Rcpp" "RCurl" "reshape2"
[61] "RJSONIO" "RNeo4j" "Rook" "rpart" "rstudio" "scales"
[67] "seriation" "spatial" "splines" "stats" "stats4" "stringr"
[73] "survival" "swirl" "tcltk" "testthat" "tools" "translations"
[79] "TSP" "utils" "whisker" "xts" "yaml" "zoo"We can then drill into those directories to find the appropriate file - in this case I wanted to look at one of the Rook examples:
$ cat /Library/Frameworks/R.framework/Versions/3.1/Resources/library/Rook/exampleApps/helloworld.R
app <- function(env){
req <- Rook::Request$new(env)
res <- Rook::Response$new()
friend <- 'World'
if (!is.null(req$GET()[['friend']]))
friend <- req$GET()[['friend']]
res$write(paste('<h1>Hello',friend,'</h1>\n'))
res$write('What is your name?\n')
res$write('<form method="GET">\n')
res$write('<input type="text" name="friend">\n')
res$write('<input type="submit" name="Submit">\n</form>\n<br>')
res$finish()
}About the author
I'm currently working on short form content at ClickHouse. I publish short 5 minute videos showing how to solve data problems on YouTube @LearnDataWithMark. I previously worked on graph analytics at Neo4j, where I also co-authored the O'Reilly Graph Algorithms Book with Amy Hodler.