merge data.frames based on year and fill in missing values

Question

I have two data.frames that I want to merge together. The first is:

datess <- seq(as.Date(\'2005-01-01\'), as.Date(\'2009-12-31\'), \'days\')
sample<-          


        

Answer 1

If y and Z are always zero in sample you do not need them there, so all you have to do is join on year like this:

 library(dplyr)
 sample %>% mutate(a = format(Date, "%Y") %>% as.numeric) %>% 
   inner_join(a %>% select(a))