Dear R Helpers,
I am missing something very elementary here, and I don't seem to get it from
the help pages of the ave, seq and seq_along functions, so I wonder if you
could offer a quick help.
To use an example from an earlier post on this list, I have a dataframe of this
kind:
dat = data.frame(name = rep(c("Mary", "Sam", "John"), c(3,2,4)))
dat$freq = ave(seq_along(dat$name), dat$name, FUN = seq_along)
dat
name freq
1 Mary 1
2 Mary 2
3 Mary 3
4 Sam 1
5 Sam 2
6 John 1
7 John 2
8 John 3
9 John 4
What I need is another column assigning a number to each name starting from
index 100, that is:
name freq nb
1 Mary 1 100
2 Mary 2 100
3 Mary 3 100
4 Sam 1 101
5 Sam 2 101
6 John 1 102
7 John 2 102
8 John 3 102
9 John 4 102
What is the easiest way to do this?
Thanks a lot for your kind help.
Dana
______________________________________________
R-help@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.
