Re: [R] Create a unique group id

2014-01-02 Thread arun
ot;a", "b", "c", "date"), row.names = c(NA,  -16L), class = "data.frame") Thanks > Date: Thu, 2 Jan 2014 08:09:59 -0800 > From: smartpink...@yahoo.com > Subject: Re: [R] Create a unique group id >

Re: [R] Create a unique group id

2014-01-02 Thread Norbi Gurracho
ames = c("a", "b", "c", "date"), row.names = c(NA,  -16L), class = "data.frame") Thanks > Date: Thu, 2 Jan 2014 08:09:59 -0800 > From: smartpink...@yahoo.com > Subject: Re: [R] Create a unique group

Re: [R] Create a unique group id

2014-01-02 Thread arun
Hi, Also, to make it general: vec1 <- with(dat,paste(a,b))  within(dat,d <- as.numeric(factor(vec1,labels=seq(length(unique(vec1)) #or  within(dat,d <- match(vec1,unique(vec1))) #or within(dat,d<- as.numeric(interaction(a,b))) #ids are unique, not in the same order A.K. On Thursday, J

Re: [R] Create a unique group id

2014-01-02 Thread arun
Hi, Try: dat <- read.table(text="a    b    c  1    1    1  1    1    1  1    1    1  1    2    2  1    2    2  1    2    2  1    3    3  1    3    3  1    3    3  2    1    4  2    1    4  2    1    4  2    2    5  2    2    5  2    2    5  2    2    5",sep="",header=TRUE) 

Re: [R] Create a unique group id

2014-01-02 Thread PIKAL Petr
ho > Sent: Thursday, January 02, 2014 12:33 PM > To: r-help@r-project.org > Subject: [R] Create a unique group id > > I have a following sample data frame. How can I create a group id of > column and b and to obtain column c? ab c 1 1 1 1 > 1 > 1

[R] Create a unique group id

2014-01-02 Thread Norbi Gurracho
I have a following sample data frame. How can I create a group id of column and b and to obtain column c? a b c 1 1 1 1 1 1 1 1 1 1 2 2 1 2 2 1 2 2 1 3 3 1 3 3 1 3 3 2 1 4 2 1