Two incredibly useful functions to throw into your .rprofile

by Karthik Ram. Average Reading Time: about a minute.

I’ve neglected this blog for quite some time but I’m getting around to finishing up a bunch of draft posts. But here is a quick one:

Listing objects in your global environment
A simple ls() doesn’t really tell you enough useful information at a glance. Most often I just want to know what I named certain data.frames or functions. This handy little function, called as lsa() will do that for you:

lsa <- function()
    obj_type <- function(x) { class(get(x)) }

Listing all functions in a certain package
This can be called with lsp(). The pattern argument will allow you to quickly find the right function if you vaguely remember the name.

lsp <-function(package, all.names = FALSE, pattern)
  package <- deparse(substitute(package))
      pos = paste("package", package, sep = ":"),
      all.names = all.names,
      pattern = pattern

Be sure to throw them both in a new environment (i.e. not the global one) so they don’t get accidentally removed when you clear your variables.

One comment on ‘Two incredibly useful functions to throw into your .rprofile’

  1. You might enjoy a similar function that lists the size of the objects in memory: http://stackoverflow.com/questions/1358003/tricks-to-manage-the-available-memory-in-an-r-session

    And the most popular Rprofile functions on stackoverflow: http://stackoverflow.com/questions/1189759/expert-r-users-whats-in-your-rprofile

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