Trim Leading/Trailing Missing Observations
Generic function for removing leading and trailing NA
s.
na.trim(object, ...) ## Default S3 method: na.trim(object, sides = c("both", "left", "right"), is.na = c("any", "all"), maxgap = Inf, ...)
object
: an object.
sides
: character specifying whether NA
s are to be removed from both sides, just from the left side or just from the right side.
is.na
: If "any" then a row will be regarded as NA
if it has any NA
s. If "all" then a row will be regarded as NA
only if all elements in the row are NA
. For one dimensional zoo objects this argument has no effect.
maxgap
: maximum number of consecutive NA
s to trim. Any longer gaps will be left unchanged.
...
: further arguments passed to methods.
An object in which leading and/or trailing NA
s have been removed.
na.approx
, na.contiguous
, na.locf
, na.omit
, na.spline
, stinterp
, zoo
# examples of na.trim x <- zoo(c(1, 4, 6), c(2, 4, 6)) xx <- zoo(matrix(c(1, 4, 6, NA, 5, 7), 3), c(2, 4, 6)) na.trim(x) na.trim(xx) # using na.trim for alignment # cal defines the legal dates # all dates within the date range of x should be present cal <- zoo(,c(1, 2, 3, 6, 7)) x <- zoo(c(12, 16), c(2, 6)) na.trim(merge(x, cal))