Error - function join()

Hi,
join() works for me.

?Please check if the function is masked by loading other packages.
dat1 <- read.table(text="
? PT_ID??? IDX_DT? OBS_DATE DAYS_DIFF OBS_VALUE CATEGORY
13? 4549 2002-08-21 2002-08-20??????? -1????? 183??????? 2
14? 4549 2002-08-21 2002-11-14??????? 85??????? 91??????? 1
15? 4549 2002-08-21 2003-02-18????? 181??????? 89??????? 1
16? 4549 2002-08-21 2003-05-15????? 267????? 109??????? 2
17? 4549 2002-08-21 2003-12-16????? 482??????? 96??????? 1
128? 4839 2006-11-28 2006-11-28??????? 0????? 179??????? 2
", header=TRUE)
dat3<-aggregate(DAYS_DIFF~PT_ID,data=dat1,min)
library(plyr)

join(dat1,dat3,type="inner",by=c("PT_ID","DAYS_DIFF"))
#? PT_ID???? IDX_DT?? OBS_DATE DAYS_DIFF OBS_VALUE CATEGORY
#1? 4549 2002-08-21 2002-08-20??????? -1?????? 183??????? 2
#2? 4839 2006-11-28 2006-11-28???????? 0?????? 179??????? 2
? A.K.? 



----- Original Message -----
From: R. Michael Weylandt <michael.weylandt at gmail.com>
To: Jhope <jeanwaijang at gmail.com>
Cc: r-help at r-project.org
Sent: Monday, October 8, 2012 3:13 AM
Subject: Re: [R] Error - function join()

Hi R-listers,

In plyr I am using coding I have used before but an error seems to be
apparent. Has the function "join" been replaced by another word? I tried
this before and it didn't work and then worked for me. But now it is not
working again.

Please advise, Jean

data.to.analyze <- join(responses, envir, by="QuadratEvent")

Error: could not find function "join"

I'm not sure there ever was a commonly used "join" function. Perhaps
you are looking for one of

?merge
?rbind
?cbind

In particular, merge(,,by = "") seems right. But this doesn't have
anything to do with plyr so I might be misunderstanding you.

Michael

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