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

I think your code would look much clear and simple if you use Forecast package.

library(forecast)
x <- zoo(df$value,df$date)
x <- as.ts(x)
x <- na.interp(x)
print(x)