Robert Sams wrote:
hi,
i need a function that can replace na's in univariate ts objects with a value interpolated linearly
using the adjacent non-na values. for example, the function i need (myfun) would do the following
x <- ts(10,11.4,NA,12,9.7)
y <- myfun(x)
y
10 11.4 11.7 12 9.7
i can code an na.action method myself to accomplish this, but has someone else already coded routines
of this nature?
many thanks,
robert
Robert Sams
Hi Robert,
Will the following do?
na.approx <- function(x) {
na <- is.na(x)
if(all(!na)) return(x)
i <- seq(along = x)
x[na] <- approx(i[!na], x[!na], i[na])$y
x
}
> x <- c(10,11.4,NA,12,9.7)
> na.approx(x)
[1] 10.0 11.4 11.7 12.0 9.7
--sundar
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