Report on the optional features which have been compiled into this build of R.
capabilities(what = NULL)
character vector or NULL
, specifying
required components. NULL
implies that all are required.
A named logical vector. Current components are
is the jpeg
function operational?
is the png
function operational?
is the tiff
function operational?
is the tcltk package operational?
Note that to make use of Tk you will almost always need to check
that "X11"
is also available.
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.
is the quartz
function operational?
Only on some macOS builds, including CRAN binary
distributions of R.
Note that this is distinct from .Platform$GUI == "AQUA"
,
which is true only when using the Mac R.app
GUI console.
always FALSE
on Windows.
FALSE
except on macOS.
does the internal method for url
and
download.file
support http:// and ftp://
URLs? Always TRUE
as from R 3.3.0.
are make.socket
and related functions
available? Always TRUE
as from R 3.3.0.
is there support for integrating libxml
with
the R event loop? Always TRUE
as from R 3.3.0.
are FIFO connections supported?
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. (If --interactive
was used, command-line editing will not actually be available.)
is internationalization conversion via
iconv
supported? Always true in current R.
is there Natural Language Support (for message translations)?
is there support for memory profiling? See
tracemem
.
is there support for the svg
,
cairo_pdf
and cairo_ps
devices, and
for type = "cairo"
in the
X11
,
bmp
, jpeg
, png
,
and tiff
devices?
is ICU available for collation? See the help on
Comparison and icuSetCollate
: it is never
used for a C locale.
does this build use a C
long double
type which is longer than double
? Some platforms do not
have such a type, and on others its use can be suppressed by the
configure option --disable-long-double.
Although not guaranteed, it is a reasonable assumption that if present long doubles will have at least as much range and accuracy as the ISO/IEC 60559 80-bit ‘extended precision’ format.
is libcurl
available in this build? Used by
function curlGetHeaders
and optionally by
download.file
and url
. As from R
3.3.0 always true for Unix-alikes, and true for CRAN Windows builds.
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.
.Platform
and extSoftVersion
(and
links there) for availability capabilities external to R but
used from R functions.
# NOT RUN {
capabilities()
if(!capabilities("ICU"))
warning("ICU is not available")
## See also the examples for 'connections'.
# }
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