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 GUI 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? Always true as from R 2.10.0.

NLS

is there Natural Language Support (for message translations)?

profmem

is there support for memory profiling?

cairo

is there support the svg, cairo_pdf and cairo_ps devices, and for type = "cairo" in the X11, bmp, jpeg, png, and tiff 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 2.14.1 ]