Using transform and plyr to add a counting column in R -

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i have two-level dataset (let's classes nested within schools) , dataset coded

like this:

school  class         1         1         2         2   b       1   b       1   b       2   b       2

but run analysis need data have unique class id, regardless of school membership.

school  class  newclass         1       1         1       1         2       2         2       2   b       1       3   b       1       3   b       2       4   b       2       4

i tried using transform , ddply, i'm not sure how keep newclass continually incrementing larger number each combination of school , class. can think of few inelegant ways this, i'm sure there easy solutions can't think of right now. appreciated!

using interaction create factor, , coerce integer:

transform(dat,nn = as.integer(interaction(class,school)))   school class nn 1          1  1 2          1  1 3          2  2 4          2  2 5      b     1  3 6      b     1  3 7      b     2  4 8      b     2  4

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