list all functions on CRAN

Question

Suppose I'm trying to run a script of unknown origin, and one of the functions is from a package that is not loaded by the script (an oversight, maybe it was loaded in the .Rprofile of the person who wrote it). How can I find in which package this function resides?

There's some information compiled on CRAN, that doesn't require the user to download/install all R packages locally; however as far as I could tell it only gives access to the DESCRIPTION files. RSiteSearch, and its web equivalent, seem to access an online database of all CRAN packages, where presumably a list of all functions would be available. Is there some way of accessing this information?

Thanks.

Edit: I know sos::findFn, utils::RSiteSearch and search.r-project; what I would like is to get the raw data that these tools use.

Answer 1

You can use the sos package, for example:

library(sos)
findFn("adply")

The output is an html including links to online documentation packages.

Answer 2

collidr package will give you this

library(collidr)
collidr::CRAN_packages_and_functions()

It will return a list of packages and their functions from CRAN i.e.

#          package_names                function_names
# 1                   A3                    A3-package
# 2                   A3                            a3
# 3                   A3                       a3.base
# 4                   A3                a3.gen.default
# 5                   A3                         a3.lm
# 6                   A3                         a3.r2
# 7                   A3                       housing
# 8                   A3            multifunctionality
# 9                   A3                       plot.A3
# 10                  A3               plotPredictions
#    ...             ...                           ...
# 294181            ZVCV                          getX
# 294182            ZVCV              helper_functions
# 294183            ZVCV                           VDP
# 294184            ZVCV                          zvcv
# 294185            ZVCV                  ZVCV_package
# 294186             zyp                   confint.zyp
# 294187             zyp                           zyp
# 294188             zyp                       zyp.sen
# 294189             zyp                 zyp.trend.csv
# 294190             zyp              zyp.trend.vector