Message-ID: <1353806963.52262.YahooMailNeo@web142605.mail.bf1.yahoo.com>
Date: 2012-11-25T01:29:23Z
From: arun
Subject: Designating a new year (Sept-Aug) in R
In-Reply-To: <BLU002-W37248CA302378C4D7D43E6B2590@phx.gbl>
HI,
If you need to order the dates.
dat1<-read.table(text="
site,date,precipitation,temp_max,temp_min
Castle Peak,January-70,0,32,18
Castle Peak,January-70,0,39,9
Castle Peak,September-70,0,34,5
Castle Peak,September-70,0,30,7
Castle Peak,October-70,0,40,6
Castle Peak,November-70,0,45,10
Castle Peak,December-70,0,43,8
Castle Peak,January-71,0,42,6
Castle Peak,February-71,0,38,5
CastlePeak,March-71,0,46,10
Castle Peak,October-71,0,42,7
Castle Peak,November-71,0,46,11
Castle Peak,December-71,0,41,9
",sep=",",stringsAsFactors=FALSE,header=TRUE)
Month1<-c("September","October","November","December")
?dat1$date[gsub("(.*)\\-.*","\\1",dat1$date)%in%Month1]<-paste0(gsub("(.*\\-).*","\\1",dat1$date[gsub("(.*)\\-.*","\\1",dat1$date)%in%Month1]),as.numeric(gsub(".*\\-(.*)","\\1",dat1$date[gsub("(.*)\\-.*","\\1",dat1$date)%in%Month1]))+1)
library(zoo)
dat1$date<-as.Date(as.yearmon(dat1$date,"%B-%y"),format="%b %Y")
dat2<-dat1[order(dat1$date),]
dat2$date<-as.yearmon(dat2$date,format="%Y-%m-%d")
row.names(dat2)<-1:nrow(dat2)
?dat2
#????????? site???? date precipitation temp_max temp_min
#1? Castle Peak Jan 1970???????????? 0?????? 32?????? 18
#2? Castle Peak Jan 1970???????????? 0?????? 39??????? 9
#3? Castle Peak Jan 1971???????????? 0?????? 42??????? 6
#4? Castle Peak Feb 1971???????????? 0?????? 38??????? 5
#5?? CastlePeak Mar 1971???????????? 0?????? 46?????? 10
#6? Castle Peak Sep 1971???????????? 0?????? 34??????? 5
#7? Castle Peak Sep 1971???????????? 0?????? 30??????? 7
#8? Castle Peak Oct 1971???????????? 0?????? 40??????? 6
#9? Castle Peak Nov 1971???????????? 0?????? 45?????? 10
#10 Castle Peak Dec 1971???????????? 0?????? 43??????? 8
#11 Castle Peak Oct 1972???????????? 0?????? 42??????? 7
#12 Castle Peak Nov 1972???????????? 0?????? 46?????? 11
#13 Castle Peak Dec 1972???????????? 0?????? 41??????? 9
A.K.
----- Original Message -----
From: nick pardikes <npardikes at hotmail.com>
To: "r-help at R-project.org" <r-help at r-project.org>
Cc:
Sent: Saturday, November 24, 2012 4:01 PM
Subject: [R] Designating a new year (Sept-Aug) in R
If I have data (below) and need some help in figuring out how I can change the values of my date column, so that a year will be from September-August? So the year
1990 = September 89-August 90; 1991
= September 90-August 91, etc...
I was trying to use the if() function, but am unable to figure it out. I basically need to change the years associated with September-December to the following year. Any
help would be greatly appreciated. Otherwise I will have to power through
it and do it all manually in excel. I am sorry that I do not have the original data associated with this posting, nor any R code with it. I really do not have a clue how to even start designating the new year.
head(mydata)
class(mydata)
"data.frame"
? ? ? ? site? ? ? ? ? ? date? ? ? ? ? ? ? ? precipitation temp_max temp_min
1 Castle Peak January-70? ? ? ? ? ? 0? ? ? 32? ? ? 18
2 Castle Peak January-70? ? ? ? ? ? 0? ? ? 39? ? ? ? 9
3 Castle Peak January-70? ? ? ? ? ? 0? ? ? 34? ? ? ? 5
4 Castle Peak January-70? ? ? ? ? ? 0? ? ? 30? ? ? ? 7
5 Castle Peak January-70? ? ? ? ? ? 0? ? ? 40? ? ? ? 6
6 Castle Peak January-70? ? ? ? ? ? 0? ? ? 45? ? ? 10
Thank you in advance and please let me know what else I can include to help solve this issue. this is my first posting on R-help.
Nick Pardikes
PhD Student
Program in Ecology, Evolution and Conservation Biology
University of Nevada, Reno
303-550-1072
http://wolfweb.unr.edu/homepage/npardikes/MySite/Welcome.html
??? ??? ??? ? ??? ??? ?
??? [[alternative HTML version deleted]]
______________________________________________
R-help at r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.