My data looks like,
A B C D
B C A D
X Y M Z
O M L P
How can I sort the rows to get something like
A B C D
A B C D
M X Y Z
L M O P
Thanks,
t(apply(DF, 1, sort))
The t() function is necessary because row operations with the apply family of functions returns the results in column-major order.
What did you try? This is really straight-forward and easy to solve with a simple loop.
> s <- x
> for(i in 1:NROW(x)) {
+ s[i,] <- sort(s[i,])
+ }
> s
V1 V2 V3 V4
1 A B C D
2 A B C D
3 M X Y Z
4 L M O P
No plyr answer yet?!
foo <- matrix(sample(LETTERS,10^2,T),10,10)
library("plyr")
aaply(foo,1,sort)
Exactly the same as DWins answer except that you don't need t()
来源：https://stackoverflow.com/questions/6063881/sorting-rows-alphabetically