Hello,
Just wondering why there is "isTRUE" and not "isFALSE".
Romain
--
Romain Francois
Professional R Enthusiast
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http://romainfrancois.blog.free.fr
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Index: src/library/base/R/identical.R
===================================================================
--- src/library/base/R/identical.R (revision 50027)
+++ src/library/base/R/identical.R (working copy)
@@ -18,3 +18,5 @@
.Internal(identical(x,y, num.eq, single.NA, attrib.as.set))
isTRUE <- function(x) identical(TRUE, x)
+
+isFALSE <- function(x) identical(FALSE, x)
Index: src/library/base/man/Logic.Rd
===================================================================
--- src/library/base/man/Logic.Rd (revision 50027)
+++ src/library/base/man/Logic.Rd (working copy)
@@ -14,6 +14,7 @@
xor(x, y)
isTRUE(x)
+isFALSE(x)
}
\alias{!}
\alias{&}
@@ -23,6 +24,7 @@
\alias{xor}
\alias{Logic}
\alias{isTRUE}
+\alias{isFALSE}
\description{
These operators act on logical and number-like vectors.
}
@@ -48,7 +50,11 @@
\code{isTRUE(x)} is an abbreviation of \code{identical(TRUE, x)}, and
so is true if and only if \code{x} is a length-one logical vector with
no attributes (not even names).
-
+
+ \code{isFALSE(x)} is an abbreviation of \code{identical(FALSE, x)}, and
+ so is true if and only if \code{x} is a length-one logical vector with
+ no attributes (not even names).
+
Numeric and complex vectors will be coerced to logical values, with
zero being false and all non-zero values being true. Raw vectors are
handled without any coercion for \code{!}, \code{&}, \code{|} and
@@ -87,7 +93,7 @@
used. For arrays (and an array result) the dimensions and dimnames
are taken from first argument if it is an array, otherwise the second.
- For \code{||}, \code{&&} and \code{isTRUE}, a length-one logical vector.
+ For \code{||}, \code{&&}, \code{isFALSE} and \code{isTRUE}, a length-one
logical vector.
}
\section{S4 methods}{
\code{!}, \code{&} and \code{|} are S4 generics, the latter two part
Index: src/library/base/man/identical.Rd
===================================================================
--- src/library/base/man/identical.Rd (revision 50027)
+++ src/library/base/man/identical.Rd (working copy)
@@ -85,7 +85,8 @@
\seealso{
\code{\link{all.equal}} for descriptions of how two objects differ;
\link{Comparison} for operators that generate elementwise comparisons.
- \code{\link{isTRUE}} is a simple wrapper based on \code{identical}.
+ \code{\link{isTRUE}} and \code{\link{isFALSE}} are simple
+ wrappers based on \code{identical}.
}
\examples{
identical(1, NULL) ## FALSE -- don't try this with ==
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