R: Report Capabilities of this Build of R

capabilities {base} | R Documentation

## Report Capabilities of this Build of R

### Description

Report on the optional features which have been compiled into this build of R.

### Usage

    capabilities(what = NULL)

### Arguments

`what` | character vector or `NULL`, specifying required components. `NULL` implies that all are required.

### Value

A named logical vector. Current components are

`jpeg` | Is the `jpeg` function operational?
`png` | Is the `png` function operational?
`tcltk` | Is the tcltk package operational?
`X11` | (Unix) Are `X11` and the data editor available?
`GNOME` | (Unix) Is the GNOME GUI in use and are `GTK` and `GNOME` graphics devices available?
`libz` | Is `gzfile` available? From R 1.5.0 this will always be true.
`http/ftp` | Are `url` and the internal method for `download.file` available?
`sockets` | Are `make.socket` and related functions available?
`libxml` | Is there support for integrating `libxml` with the R event loop?
`cledit` | Is command-line editing available in the current R session? This is false in non-interactive sessions. It will be true if `readline` supported has been compiled in and `--no-readline` was not invoked.
`IEEE754` | Does this platform have IEEE 754 arithmetic? Note that this is more correctly known by the international standard IEC 60559.
`bzip2` | Is `bzfile` available?
`PCRE` | Is the Perl-Compatible Regular Expression library available? This is needed for the `perl = TRUE` option to `grep` are related function.

### See Also

`.Platform`

### Examples

    capabilities()

    if(!capabilities("http/ftp"))
       warning("internal download.file() is not available")

    ## See also the examples for 'connections'.

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