all {base} | R Documentation |
Given a set of logical vectors, are all of the values true?
all(..., na.rm = FALSE)
... |
zero or more logical vectors. Other objects of zero length are ignored, and the rest are coerced to logical ignoring any class. |
na.rm |
logical. If true |
This is a generic function: methods can be defined for it
directly or via the Summary
group generic.
For this to work properly, the arguments ...
should be
unnamed, and dispatch is on the first argument.
Coercion of types other than integer (raw, double, complex, character, list) gives a warning as this is often unintentional.
This is a primitive function.
The value is a logical vector of length one.
Let x
denote the concatenation of all the logical vectors in
...
(after coercion), after removing NA
s if requested by
na.rm = TRUE
.
The value returned is TRUE
if all of the values in x
are
TRUE
(including if there are no values), and FALSE
if at
least one of the values in x
is FALSE
. Otherwise the
value is NA
(which can only occur if na.rm = FALSE
and
...
contains no FALSE
values and at least one
NA
value).
This is part of the S4 Summary
group generic. Methods for it must use the signature
x, ..., na.rm
.
That all(logical(0))
is true is a useful convention:
it ensures that
all(all(x), all(y)) == all(x, y)
even if x
has length zero.
Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988) The New S Language. Wadsworth & Brooks/Cole.
any
, the ‘complement’ of all
, and
stopifnot(*)
which is an all(*)
‘insurance’.
range(x <- sort(round(stats::rnorm(10) - 1.2, 1)))
if(all(x < 0)) cat("all x values are negative\n")
all(logical(0)) # true, as all zero of the elements are true.