R: Report Capabilities of this Build of R

capabilities {base}

R Documentation

Report Capabilities of this Build of R

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

capabilities(what = NULL)

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

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.

capabilities()

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

## See also the examples for 'connections'.