repeat_last: repeat last non-NA value

In grebbel/formr_test: formr survey framework

Description

Will repeat the last non-NA value. This is also known as carrying the last observation forward/backward. It's faster than zoo::na.locf http://rpubs.com/rubenarslan/repeat_last_na_locf and other alternatives. By specifying maxgap, you can choose not to bridge overly long gaps. By specifying forward = FALSE, you can carry the last observation backward.

Usage

repeat_last(x, forward = TRUE, maxgap = Inf, na.rm = FALSE)

Arguments

x	vector to be repeated
forward	carry last observation forward? or backward (FALSE)
maxgap	bridge only up to x NAs (defaults to Inf)
na.rm	whether to omit NAs at the beginning (defaults to FALSE)

Examples

x = c(NA,NA,1,NA,NA,NA,NA,NA,NA,NA,NA,2,3,4,NA,NA,NA,NA,NA,5, NA)
data.frame(x, 
   repeat_last(x), 
   repeat_last(x, forward = FALSE), 
   repeat_last(x, maxgap = 5), 
check.names = FALSE)

grebbel/formr_test documentation built on May 17, 2019, 8:34 a.m.