FInding date gaps in R

Question

I am using R and have a vector of dates as Day of Year (DOY) in which some days are missing. I want to find where these missing days are.

DOY <- c(1,2,5,6,7,         


        

Answer 1

rDOY <- range(DOY); 
rnDOY <- seq(rDOY[1],rDOY[2]) 
rnDOY[!rnDOY %in% DOY]
[1]  3  4  8  9 11 12 13 14

If instead you don't want the mssing days and do wnat the beginnings and ends of the missing items:

> DOY[ diff(DOY)!=1]
[1]  2  7 10
> DOY[-1] [ diff(DOY)!=1]
[1]  5 10 15