I all

I am just trying to get the idea of a loop if statement for another
purpose. I was going to label a new variable based on date ie first week
1, second week 2 etc. My code in bold is wrong but seems logical to me,
could someone help.

x <-
rep(c(2660156,2663703,2658165,2659303,2661531,2660914),c(2,2,2,2,1,1))
y <-
rep(c(6476767,6475013,6475487,6479659,6477004,6476388),c(2,2,2,2,1,1))
date <- rep(as.Date(c("2008-01-01","2008-01-14","2008-01-28"), format 
 = "%Y-%m-%d"),c(4,4,2))
a<-data.frame(x,y,date)
a$wk<-rep(c(0),nrow(a))
a
set<-as.Date(c("2008-01-01"), format  = "%Y-%m-%d")
set

for(i in a$date){
if (a$date[i]>set & a$date[i]<set +7  ){a$wk<-1}else
if (a$date[i]>set +7){a$wk<-2}else {a$wk<-3}
}
a

Kind regards

andy

Andrew McFadden MVS BVSc
Incursion Investigator
Investigation & Diagnostic Centres - Wallaceville Biosecurity New 
Zealand Ministry of Agriculture and Forestry

Phone 04 894 5600 Fax 04 894 4973 Mobile 029 894 5611 Postal address: 
Investigation and Diagnostic Centre- Wallaceville Box 40742 Ward St 
Upper Hutt


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