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?

libz

Is gzfile available?

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.

capabilities()

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

## See also the examples for `connections'.