linear interpolate missing values in time series

Question

I would like to add all missing dates between min and max date in a data.frame and linear interpolate all missing values, like

df <- data.fra         


        

Answer 1

Another nice and short solution (using imputeTS):

library(imputeTS)
x <- zoo(df$value,df$date)
x <- na.interpolation(x, option = "linear")
print(x)