HI,
May be this helps:
dat1<-read.table(text="
DATE PAYS nb_pays.ILI.
1 24/04/2009 usa 0
2 24/04/2009 usa 0
3 24/04/2009 Mexique 0
4 24/04/2009 Mexique 0
5 26/04/2009 usa 20
6 26/04/2009 usa 20
7 26/04/2009 usa 20
8 26/04/2009 usa 20
9 26/04/2009 usa 20
10 26/04/2009 Mexique 18
11 27/04/2009 usa 40
12 27/04/2009 Mexique 26
13 27/04/2009 Canada 6
14 27/04/2009 Spain 1
15 27/04/2009 Spain 18
16 28/04/2009 Canada 6
",sep="",header=TRUE,stringsAsFactors=FALSE)
fun1<-function(dat,date1,date2){
date1new<-as.Date(date1,format="%d/%m/%Y")
date2new<-as.Date(date2,format="%d/%m/%Y")
dat[,1]<-as.Date(dat$DATE,format="%d/%m/%Y")
res1<-with(dat,aggregate(nb_pays.ILI.,by=list(DATE,PAYS),sum))
names(res1)<-names(dat)
res2<-res1[res1[,1]>=date1new & res1[,1] <=date2new,]
res2<-res2[order(res2[,1],res2[,2]),]
#res2[,1]<-as.POSIXct(res2[,1]) #if you want to convert to as.POSIXct()
rownames(res2)<-1:nrow(res2)
res2}
date1="24/04/2009"
date2="27/04/2009"
fun1(dat1,date1,date2)
# DATE PAYS nb_pays.ILI.
#1 2009-04-24 Mexique 0
#2 2009-04-24 usa 0
#3 2009-04-26 Mexique 18
#4 2009-04-26 usa 100
#5 2009-04-27 Canada 6
#6 2009-04-27 Mexique 26
#7 2009-04-27 Spain 19
#8 2009-04-27 usa 40
fun1(dat1,"27/04/2009","28/04/2009")
# DATE PAYS nb_pays.ILI.
#1 2009-04-27 Canada 6
#2 2009-04-27 Mexique 26
#3 2009-04-27 Spain 19
#4 2009-04-27 usa 40
#5 2009-04-28 Canada 6
A.K.
----- Original Message -----
From: anoumou <teko_maur...@yahoo.fr>
To: r-help@r-project.org
Cc:
Sent: Saturday, November 10, 2012 8:21 AM
Subject: [R] help on date dataset
Hi everybody,
I am beginer in R and I need your precious help.
I want to create a small function in R as in sas to retrieve date.
I have a file with data that import in R.
DATE PAYS nb_pays.ILI.
1 24/04/2009 usa 0
2 24/04/2009 usa 0
3 24/04/2009 Mexique 0
4 24/04/2009 Mexique 0
5 26/04/2009 usa 20
6 26/04/2009 usa 20
7 26/04/2009 usa 20
8 26/04/2009 usa 20
9 26/04/2009 usa 20
10 26/04/2009 Mexique 18
11 27/04/2009 usa 40
12 27/04/2009 Mexique 26
13 27/04/2009 Canada 6
14 27/04/2009 Spain 1
15 28/04/2009 Canada 6
I want to create something like that:
• When entering two dates date1,date2 in the fuction extraction.
The result must be: a new subdata with one line per date , per PAYS,per
nb_pays.ILI (by summing all the number in variable nb_pays.ILI per date,per
country) and the date must be between date1 and date2.
I sart to do somethings like that
extraction=function(date1,date2)
{date<-derdata[["DATE"]]
date
sort(date)
PAYS<-derdata[["PAYS"]]
nb_pays.ILI<-derdata[["nb_pays.ILI."]]
test1<-as.character(date,"%d %m %y")
test1
#the first date
date1<- "04 03 2009"
date1 <- strptime(date1, "%d %m %Y")
date1
unlist(unclass(date1))
date1 <- as.POSIXct(date1)
date1
attributes(date1)
date1 <-unclass(date1)
date1
#the second date
date2<- "04 12 2009"
date2 <- strptime(date2, "%d %m %Y")
date2
unlist(unclass(date2))
date2 <- as.POSIXct(date2)
date2
attributes(date2)
date2 <-unclass(date2)
date2
B1<- as.POSIXct(test1)
B1 <-unclass(B1)
B1
B4 <- B1[(B1>date1) & (B1<date2)]
B4
}
--
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______________________________________________
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
