coalesce: Coalescing missing values

In data.table: Extension of `data.frame`

Coalescing missing values

Description

Fill in missing values in a vector by successively pulling from candidate vectors in order. As per the ANSI SQL function COALESCE, dplyr::coalesce and hutils::coalesce. Unlike BBmisc::coalesce which just returns the first non-NULL vector. Written in C, and multithreaded for numeric and factor types.

Usage

  fcoalesce(...)

Arguments

...	A set of same-class vectors. These vectors can be supplied as separate arguments or as a single plain list, data.table or data.frame, see examples.

Details

Factor type is supported only when the factor levels of each item are equal.

NaN is considered missing (note is.na(NaN) and all.equal(NA_real_, NaN) are both TRUE).

Value

Atomic vector of the same type and length as the first vector, having NA values replaced by corresponding non-NA values from the other vectors. If the first item is NULL, the result is NULL.

See Also

fifelse

Examples

x = c(11L, NA, 13L, NA, 15L, NA)
y = c(NA, 12L, 5L, NA, NA, NA)
z = c(11L, NA, 1L, 14L, NA, NA)
fcoalesce(x, y, z)
fcoalesce(list(x,y,z))   # same
fcoalesce(x, list(y,z))  # same

data.table documentation built on Oct. 10, 2024, 5:07 p.m.