dataframe - Sort second to fifth column for each row in R

Question

I have a data frame in R, and I need to sort each row for the second to fifth column independently.

For example, I have the following

1 2 3 1 4 5
2 1 3 2 6 7
3 7 2 1 3 2
...

and I need to get

1 1 2 3 4 5
2 1 2 3 6 7
3 1 2 2 3 7
...

How to do this quickly and beautifully?

Answer 1

Something like this may be useful

> cbind(df[,1], t(apply(df[,-1], 1, sort)))
     [,1] [,2] [,3] [,4] [,5] [,6]
[1,]    1    1    2    3    4    5
[2,]    2    1    2    3    6    7
[3,]    3    1    2    2    3    7

where df is a data.frame:

df <- read.table(text="1 2 3 1 4 5
2 1 3 2 6 7
3 7 2 1 3 2", header=FALSE)