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?
`tiff`	Is the `tiff` function operational?
`tcltk`	Is the tcltk package operational? Note that to make use of Tk you will almost always need to check that `"X11"` is also available.
`X11`	Are the `X11` graphics device and the X11-based data editor available? This loads the X11 module if not already loaded, and checks that the default display can be contacted unless a `X11` device has already been used.
`aqua`	Are the `R.app` GUI components and the `quartz` function operational? Only on some Mac OS X builds. Note that this is distinct from `.Platform$GUI == "AQUA"`, which is true when using the Mac `R.app` console.
`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?
`fifo`	are FIFO connections supported?
`cledit`	Is command-line editing available in the current R session? This is false in non-interactive sessions. It will be true for the command-line interface if `readline` support has been compiled in and --no-readline was not used when R was invoked.
`iconv`	is internationalization conversion via `iconv` supported?
`NLS`	is there Natural Language Support (for message translations)?
`profmem`	is there support for memory profiling?
`cairo`	is there support for `type="Cairo"` in `X11`, `png`,`jpeg`, `tiff` and `bmp`, and for the `svg`, `cairo_pdf` and `cairo_ps` devices?

Note to Mac OS X users

Capabilities "jpeg", "png" and "tiff" refer to the X11-based versions of these devices. If capabilities("aqua") is true, then these devices with type="quartz" will be available, and out-of-the-box will be the default type. Thus for example the tiff device will be available if capabilities("aqua") || capabilities("tiff") if the defaults are unchanged.

Examples

capabilities()

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

## See also the examples for 'connections'.

[Package base version 2.9.0 ]