R convert dates into Julian days in a loop -

i have date year 1996 till 2014 need convert julian days. here example data:

date<- c("21-jul", "14-jul", "08-jul", "08-jul","16-jul","22-jul", "10-jul", "02-jul", "06-jul","18-jul","24-jul", "15-jul", "03-jul", "04-jul","19-jul")  year<-rep(1996:1998,each=5) dat<-as.data.frame(cbind(date,year)) dat$date<-as.character(dat$date) 

for each year, want convert date julian day i.e. day of year. used following function link:

convert date without year julian day (number of days since start of year)

for leap-year (e.g. 1996), can convert date julian day following:

julian(as.date(paste0("1996-", ds$ds), format="%y-%d-%b"), origin=as.date("1996-01-01"))+1 

for non-leap year (e.g. 1997), can convert date julian day following:

julian(as.date(paste0("1997-", ds$ds), format="%y-%d-%b"), origin=as.date("1997-01-01")) 

now, want in loop period 1996 2014. did this:

install.packages("lubridate") # function detecting leap year library("lubridate") years <- 1996:2014 leap<-years[leap_year(years)]  for(i in 1996:2014){  if(i %in% leap){     julian(as.date(paste0(i,"-", ds$ds), format="%y-%d-%b"), origin=as.date(i,"-01-01"))+1 } else {    julian(as.date(paste0(i,"-", ds$ds), format="%y-%d-%b"), origin=as.date(i,"-01-01")) }}  error in chartodate(x) :  character string not in standard unambiguous format 

i think error happening because of paste0(i,"-", ds$ds) , origin=as.date(i,"-01-01")). know how address it?

why don't use posixlt class contains julian days since start of year 1 of components?

as.posixlt(as.date(paste(dat$year, dat$date, sep = "-"),         "%y-%d-%b"))$yday #[1] 202 195 189 189 197 202 190 182 186 198 204 195 183 184 199