Sorting each row of a data frame [duplicate]

Question

I am trying to sort each row of a data frame using this line,

sapply(df, function(x) sort(x))

However, the columns are getting sorted instead of the rows.

For example, this data frame

5          10          7          1          5
6           3          9          2          4
4           5          1          3          3

is ending up like this:

4           3          1          1          3
5           5          7          2          4
6          10          9          3          5

And I want this:

1 5 5 7 10
2 3 4 6 9
1 3 3 4 5

Any recommendations? Thanks

Answer 1

You could use the plain apply function with MARGIN = 1 to apply over rows and then transpose the result.

t(apply(df, 1, sort))