[R] Sorting problem

[Kåre Edvardsen]

R-gurus...

I've got a 5 column dataframe where I'd like to plot each ID's "b"
against "c" with "b" in ascending order (within the same ID). How do I
sort "b" so that the other variables are altered equally?

   ID    a    b  c     d
   101   1  240 26.7  21.85
   101   2  335 21.8  21.85
   101   3 1387 26.6  21.85
   101   4  877 24.1  21.85
   101   5  978 24.3  21.85
   101   7 4962 28.3  21.85
   101   8 1690 26.1  21.85
   101   9 2038 24.4  21.85
   102   1  240 53.4  51.65
   102   2  533 50.4  51.65
   102   3  802 53.3  51.65
   102   4 1155 47.0  51.65
   102   5  953 47.7  51.65
   102   7 5353 47.8  51.65
   .
   .
   .
   115   9  840 34.9  42.01

All the best,
Kare