Hi,
I have a matrix like this, two columns: a, b
a b c1 21 c2 19 c2 20 c2 20 c4 25 c5 18 c5 18
how to prepare a new matrix removing the rows with repeated units in b
columns, like there are two 20 and two 18 in b column (others are unique in
b col). I wanna a pure matrix with one 20 and one 18.
Thanks a lot!
Yan
[[alternative HTML version deleted]]
______________________________________________
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.
