Look into R's scoping rules. E.g., https://bookdown.org/rdpeng/rprogdatascience/scoping-rules-of-r.html.
* When a function looks up a name, it looks it up in the environment in which the function was defined. * Functions in a package are generally defined in the package's environment (although sometimes they are in a descendent of the parent's environment). * When one searches an environment for a name, if it is not found in the environment the search continues in the parent environment of that environment, recursively until the parent environment is the empty environment. > with(environment(wdman::selenium), java_check) function () { javapath <- Sys.which("java") if (identical(unname(javapath), "")) { stop("PATH to JAVA not found. Please check JAVA is installed.") } javapath } <bytecode: 0x000001fd0ab826a8> <environment: namespace:wdman> -Bill On Thu, Jan 19, 2023 at 2:28 PM akshay kulkarni <akshay...@hotmail.com> wrote: > dear members, > I am using the RSelenium package which uses > the function selenium() from the wdman package. The selenium function > contains the function java_check at line 12. If I try to run it, it throws > an error: > > > javapath <- java_check() > Error in java_check() : could not find function "java_check" > > Also: > > > exists("java_check") > [1] FALSE > > But when I run selenium(), it works fine.... > > How do you explain this conundrum? You can refer to this link: > https://github.com/ropensci/wdman/issues/15 > > Specifically what concept of R explains this weird behaviour? > > Thanking you, > Yours sincerely, > AKSHAY M KULKARNI > > > [[alternative HTML version deleted]] > > ______________________________________________ > R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see > 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. > [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see 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.