| apropos {utils} | R Documentation |
apropos() returns a character vector giving the names of
all objects in the search list matching what.
find() is a different user interface to the same task.
apropos(what, where = FALSE, ignore.case = TRUE, mode = "any") find(what, mode = "any", numeric. = FALSE, simple.words = TRUE)
what |
character string with name of an object, or more generally a regular expression to match against. |
where, numeric. |
a logical indicating whether positions in the search list should also be returned |
ignore.case |
logical indicating if the search should be
case-insensitive, TRUE by default. Note that in R versions
prior to 2.5.0, the default was implicitly ignore.case = FALSE. |
mode |
character; if not "any", only objects whose
mode equals mode are searched. |
simple.words |
logical; if TRUE, the what argument is
only searched as whole word. |
If mode != "any" only those objects which are of mode mode
are considered.
If where is TRUE, the positions in the search list are
returned as the names attribute.
find is a different user interface for the same task as apropos.
However, by default (simple.words == TRUE), only full words are
searched with grep(fixed = TRUE).
Note that in R versions prior to 2.5.0, what was allowed to be
non-character, such that find(cor) worked as it does in S.
This possibility has been dropped in line with the aim of minimizing
all use of non-standard evaluation in R.
Kurt Hornik and Martin Maechler (May 1997).
glob2rx to convert wildcard patterns to regular expressions.
objects for listing objects from one place,
help.search for searching the help system,
search for the search path.
## Not run: apropos("lm")
apropos("GLM") # more than a dozen
apropos("GLM", ignore.case = FALSE) # not one
apropos("lq")
cor <- 1:pi
find("cor") #> ".GlobalEnv" "package:stats"
find("cor", num=TRUE) # numbers with these names
find("cor", num=TRUE, mode="function")# only the second one
rm(cor)
## Not run: apropos(".", mode="list") # a long list
# need a DOUBLE backslash '\\' (in case you don't see it anymore)
apropos("\\[")
## Not run: # everything
length(apropos("."))
# those starting with 'pr'
apropos("^pr")
# the 1-letter things
apropos("^.$")
# the 1-2-letter things
apropos("^..?$")
# the 2-to-4 letter things
apropos("^.{2,4}$")
# the 8-and-more letter things
apropos("^.{8,}$")
table(nchar(apropos("^.{8,}$")))
## End(Not run)