str_data function

Overview on All Datasets in an R Package

Provide an overview over all datasets available by data() in a (list of) given packages.

str_data(pkgs, filterFUN, ...)

Arguments

• pkgs: character vector of names of packages.

• filterFUN: optionally a logical

  function for filtering the objects.

• ...: potentical further arguments to be passed to str; str(utils:::str.default) gives useful list.

Returns

invisibly (see invisible) a list with named components matching the pkgs argument. Each of these components is a named list with one entry per data(.) argument name. Each entry is a character vector of the names of all objects, typically only one.

The side effect is, as with str(), to print everything (via cat) to the console.

Author(s)

Martin Maechler

See Also

str, data.

Examples

str_data("cluster")

str_data("datasets", max=0, give.attr = FALSE)

## Filtering (and return value)
dfl <- str_data("datasets", filterFUN=is.data.frame)
str(df.d <- dfl$datasets)
## dim() of all those data frames:
t(sapply(unlist(df.d), function(.) dim(get(.))))

### Data sets in all attached packages but "datasets" (and stubs):
s <- search()
(Apkgs <- sub("^package:", '', s[grep("^package:", s)]))
str_data(Apkgs[!Apkgs %in% c("datasets", "stats", "base")])