Try this.
dd[order(gsub("chr","",dd$b)),]
You need regular expressions if chr is not the only characterstring
that is prepended to the numbers.
look for
?strsplit
Nikhil Kaza
University of North Carolina
nikhil.l...@gmail.com
On May 20, 2010, at 8:28 AM, Yuan Jian wrote:
Hello,
I have a dataframe:
dd <- data.frame(b = c("chr2", "chr1", "chr15", "chr13"),
x = c("A", "D", "A", "C"), y = c(8, 3, 9, 9),
z = c(1, 1, 1, 2))
dd
b x y z
1 chr2 A 8 1
2 chr1 D 3 1
3 chr15 A 9 1
4 chr13 C 9 2
Now I want to sort them according column "b", but only its number is
considered:
b x y z
1 chr1 D 3 1
2 chr13 C 9 2
3 chr15 A 9 1
4 chr2 A 8 1
thanks
jian
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