Converting Monthly Data to Daily in R

Question

I have a data.frame df that has monthly data:

Date           Value 
2008-01-01      3.5          
2008-02-01      9.5          
2008-03-01      0.1                   


        

Answer 1

Another way:

library(lubridate)

d <- read.table(text = "Date           Value 
                2008-01-01      3.5          
                2008-02-01      9.5          
                2008-03-01      0.1",
                stringsAsFactors = FALSE, header = TRUE)

Dates <- seq(from = min(as.Date(d$Date)),
             to = ceiling_date(max(as.Date(d$Date)), "month") - days(1),
             by = "1 days")

data.frame(Date = Dates,
           Value = setNames(d$Value, d$Date)[format(Dates, format = "%Y-%m-01")])