tvdb | R Documentation |
tvdb_down
downloads from CRAN the file "Views.rds", a file refreshed every day that
describes the task views available in CRAN for this day, rearranges the list in an
alphabetical order and gives names to the list names, then loads in .GlobalEnv
this list (of class ctvlist) under the name tvdb
and saves it with the filename
tvdb.rda
.
tvdb_load
loads the file filename
in .GlobalEnv under the name tvdb
.
Equivalent to load("tvdb.rda")
.
tvdb_vec
displays the list of the task views. There are 36 task views in August 2018.
tvdb_dfr
extracts from tvdb
a data.frame version, name, topic
of the task views.
tvdb_list
extracts from tvdb
the list of the task views and the referenced
packages.
tvdb_pkgs
displays the packages referenced by one or several task views.
Visit s_crandb_tvdb
to conduct task view maintenance.
tvdb_down(dir = ".", repos = getOption("repos")[1])
tvdb_load(filename = "tvdb.rda")
tvdb_vec(tvdb = get("tvdb", envir = .GlobalEnv))
tvdb_dfr(tvdb = get("tvdb", envir = .GlobalEnv))
tvdb_list(tvdb = get("tvdb", envir = .GlobalEnv))
tvdb_pkgs(..., char = NULL, tvdb = get("tvdb", envir = .GlobalEnv))
dir |
character. The directory where "tvdb.rda" is saved.
Default value |
repos |
character. The address of your local CRAN. |
filename |
character. The path to file "tvdb.rda". The default is to read in the current directory. |
tvdb |
list. The list of the task views. |
... |
any format recognized by |
char |
(name to) a character vector or a list. Use this argument if
|
### DOWNLOAD AND VISUALIZE THE TASK VIEWS (tvdb)
## In real life, download tvdb from CRAN or load it from your directory
## with functions tvdb_down() or tvdb_load().
## In this example, we use a small file.
tvdb_load(system.file("data", "ztvdb.rda", package = "RWsearch"))
length(tvdb)
## List the task views
tvdb_vec()
tvdb_dfr()
tvdb_pkgs("Genetics")
lengths(tvdb_list())
## Here, 'lst' is subsetted from the small crandb file.
crandb_load(system.file("data", "zcrandb.rda", package = "RWsearch"))
funIN <- function (x, y) x[match(x, y, nomatch = 0) > 0]
lst <- lapply(tvdb_list()[1:2], funIN, crandb$Package) ; lst
if (interactive()) p_display7(lst[[1]], dir = file.path(tempdir(), "ptvdbdown"))
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