pmax
Parallel Maximum or Minimum
Description
Gives the maximum or minimum for each position in a number of vectors.
Usage
pmax(..., na.rm = FALSE)
pmin(..., na.rm = FALSE)
pmax.int(..., na.rm = FALSE)
pmin.int(..., na.rm = FALSE)
Arguments
| ... |
any number of numeric or character vectors.
Missing values (NA) are allowed.
|
| na.rm |
a logical flag. If TRUE, missing values are
ignored. The default is FALSE.
|
Details
If an element of any of the arguments is NA, the
corresponding element of the result is also NA unless
na.rm=TRUE.
The maximum or minimum is found of the non-missing values when
na.rm=TRUE.
Note the difference between pmax, pmin and
max, min. The latter two return a single element,
which is the maximum or minimum of all arguments.
Value
returns a vector whose first element is the maximum (pmax) or
minimum (pmin) of the first elements of the arguments, and
similarly for the second element, and so on. The length of the
vector is the length of the longest argument. Shorter
vectors are reused cyclically.
If the first argument is the longest, then the result has the
attributes of the first argument.
See Also
Examples
x <- c(4, 19, 23, 3, 20)
y <- c(9, 24, 21, 4, NA)
z <- pmax(x, y, 5) # vector as long as larger of x and y
# where z[i] is max of x[i], y[i], and 5
# as above but missing values are ignored
z <- pmax(x, y, 5, na.rm = TRUE)
z <- pmax(c(1,2,1),c(5,1,1),c(4,0))
z
# [1] 5 2 4