Hi,
I have a silly question regarding the usage of two commands: read.table and
gregexprï¼
For read.table, if I read a matrix and set header = T, I found that all the
dash ("-") becomes dots (".")
A = read.table("Matrix.txt", sep = "\t", header = F)
A[1,1]
# "A-B-C-D".
A = read.table("Matrix.txt", sep = "\t", header = T)
colnames(A)[1]
# "A.B.C.D"
Is there a way to use the header = T argument, but still keep the original
format "A-B-C-D"?
For gregexpr,
gregexpr("-","A-B-C-D")[[1]]
#[1] 2 4 6
#attr(,"match.length")
#[1] 1 1 1
gregexpr(".","A.B.C.D")[[1]]
[1] 1 2 3 4 5 6 7
attr(,"match.length")
[1] 1 1 1 1 1 1 1
Looks like dots means all the characters. Is there a way that I can extract
the position of the dots specifically?
Thanks,
-Jack
[[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.
