sfsmisc (version 1.1-19)

str_data: Overview on All Datasets in an R Package

Description

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

Usage

str_data(pkgs, filterFUN, ...)

Value

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.

Arguments

pkgs

character vector of names of R packages.

filterFUN

optionally a logical function for filtering the R objects.

...

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

Author

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")])