It is an alias for data.table
fcoalesce. For details see fcoalesce
A vector the same length as the first ... argument with NA values replaced by the first non-missing value.
# examples from dplyr x = sample(c(1:5, NA, NA, NA)) coalesce(x, 0L) y = c(1, 2, NA, NA, 5) z = c(NA, NA, 3, 4, 5) coalesce(y, z)
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