data.table (version 1.12.8)

nafill: Fill missing values

Description

Fast fill missing values using constant value, last observation carried forward or next observation carried backward.

Usage

nafill(x, type=c("const","locf","nocb"), fill=NA,
       verbose=getOption("datatable.verbose"))
setnafill(x, type=c("const","locf","nocb"), fill=NA, cols=seq_along(x),
          verbose=getOption("datatable.verbose"))

Arguments

x

vector, list, data.frame or data.table of numeric columns.

type

character, one of "const", "locf" or "nocb". Defaults to "const".

fill

numeric or integer, value to be used to fill when type=="const".

cols

numeric or character vector specifying columns to be updated.

verbose

logical, TRUE turns on timing messages to the console.

Value

A list except when the input is a vector in which case a vector is returned. For setnafill the input argument is returned, updated by reference.

Details

Only double and integer data types are currently supported.

See Also

shift, data.table

Examples

# NOT RUN {
x = 1:10
x[c(1:2, 5:6, 9:10)] = NA
nafill(x, "locf")

dt = data.table(v1=x, v2=shift(x)/2, v3=shift(x, -1L)/2)
nafill(dt, "nocb")

setnafill(dt, "locf", cols=c("v2","v3"))
dt
# }