Interpolate NA values

Question

I have two set of samples that are time independent. I would like to merge them and calculate the missing values for the times where I do not have values of both. Simplified

Answer 1

Using the zoo package:

library(zoo)
Cz <- zoo(C)
index(Cz) <- Cz[,1]
Cz_approx <- na.approx(Cz)