ID EN
Miscellaneous

base-internal

R Base 3.6.2

Internal objects in the base package most of which are only user-visible because of the special nature of the base namespace.

Syntax

R
.subset(x, …)
.subset2(x, &#8230;)<p></p><p>.getRequiredPackages(file = "DESCRIPTION", lib.loc = NULL,
                     quietly = FALSE, useImports = FALSE)
.getRequiredPackages2(pkgInfo, quietly = FALSE, lib.loc = NULL,
                      useImports = FALSE)</p><p><!-- %testPlatformEquivalence(built, run) -->
<!-- % -->
.isMethodsDispatchOn(onOff = NULL)</p><p>sys.load.image(name, quiet)
sys.save.image(name)</p><p>.row_names_info(x, type = 1L)
.set_row_names(n)</p><p>findPackageEnv(info)</p><p>lazyLoadDBfetch(key, file, compressed, hook)</p><p>.TAOCP1997init(seed)</p><p>.gt(x, i, j)
.gtn(x, strictly)</p><p>.primTrace(obj)
.primUntrace(obj)</p><p>.Date(xx, cl = "Date")
.POSIXct(xx, tz = NULL, cl = c("POSIXct", "POSIXt"))
.POSIXlt(xx, tz = NULL, cl = c("POSIXlt", "POSIXt"))
.difftime(xx, units, cl = "difftime")</p><p>.cache_class(class, extends)</p><p>.popath</p><p>.mapply(FUN, dots, MoreArgs)</p><p>.detach(pos)</p><p>.maskedMsg(same, pkg, by)</p><p>.fixupGFortranStdout()
.fixupGFortranStderr()</p>

Arguments

Parameter Description
x object from which to extract elements.
file The full path to the DESCRIPTION file of a package.
lib.loc a character vector describing the location of R library trees to search through, or NULL. The default value of NULL corresponds to all libraries currently known to .libPaths().
quiet logical. Should this not give warnings or an error if the package(s) are not found?
useImports logical. Should the Imports field be processed?
quietly logical: should message(s) be printed.
pkginfo A processed DESCRIPTION file of class "packageDescription2".
built, run platform strings of the form "cpu-vendor-os".
name name of image file to save or load.
x an object with a "row.names" attribute, typically a data frame.
type integer. Currently type = 0 returns the internal "row.names" attribute (possibly NULL), type = 2 the number of rows implied by the attribute, and type = 1 the latter with a negative sign for ‘automatic’ row names.
n integer. The number of rows.
info character string such as "package:MASS".
key the object name in a lazyload database.
file the filepath to a lazyload database.
compressed logical: are the values in the database compressed?
refhook a load hook: see unserialize.
seed a length-one integer vector.
i, j indices.
strictly logical.
obj an R object.
xx a classless object to be placed into the class.
tz an optional time zone.
cl an optional character vector of classes containing the default classes.
units see difftime.
&#8230; Arguments passed to non-dot name versions.
FUN function to apply, found via match.fun.
dots list of arguments to vectorize over (vectors or lists of strictly positive length, or all of zero length).
MoreArgs a list of other arguments to FUN.
pos an integer.
same character vector of same objects, masking others.
pkg character string naming the package which is masked from or by.
by logical indicating if the masking happens by pkg, or (by = FALSE) from pkg.

Return Value

.getRequiredPackages and .getRequiredPackages2 return invisible(). testPlatformEquivalence returns TRUE or FALSE.

Details

The functions .subset and .subset2 are essentially equivalent to the [ and [[ operators, except that methods dispatch does not take place. This is to avoid expensive unclassing when applying the default method to an object. They should not normally be invoked by end users. Note that unlike the operators they are builtins and not specials (all arguments are evaluated) and hence do not allow missing arguments. .getRequiredPackages2 attaches all the packages mentioned in the Depends field: failure to find a package is an error. It also checks the versions of the packages found against the Depends field. .getRequiredPackages is a wrapper to .getRequiredPackages2 using a DESCRIPTION file. The function .isMethodsDispatchOn() returns TRUE if the S4 method dispatch has been turned on in the evalua