The bolding is lost in plain-text email,
but some things to note:
:: for(i in a$date){ - this will make i take on date values,
you probably meant i to index the rows of a[]
:: you missed indexing in your replacements in the
then and else clauses
:: you probably want some equalities in your test conditions,
not all '<' '>' inequalities
:: need an extra condition for the 2 weeks test clause
for(i in seq(nrow(a))){
if (a$date[i]>=set & a$date[i]<set +7 ){a$wk[i]<-1}else
if (a$date[i]>=set +7 & a$date[i]<set +14 ){a$wk[i]<-2}else {a$wk[i]<-3}
}
> a
x y date wk
1 2660156 6476767 2008-01-01 1
2 2660156 6476767 2008-01-01 1
3 2663703 6475013 2008-01-01 1
4 2663703 6475013 2008-01-01 1
5 2658165 6475487 2008-01-14 2
6 2658165 6475487 2008-01-14 2
7 2659303 6479659 2008-01-14 2
8 2659303 6479659 2008-01-14 2
9 2661531 6477004 2008-01-28 3
10 2660914 6476388 2008-01-28 3
-----Original Message-----
From: [EMAIL PROTECTED] on behalf of Andrew McFadden
Sent: Thu 6/5/2008 8:46 PM
To: r-help@r-project.org
Subject: [R] R loop
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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