split/decompose lines

I need to split (or decompose) one line into many lines using one field as
a
reference.

I have a table with the following format:

A   B   Frequency
23  3   2
24  2   5
25  1   3

olddata[rep(1:nrow(olddata),olddata$B),] 
repeats the rows of the data frame the appropriate number
of times.  The new Frequency column is trivial
(rep(1,sum(olddata$B))

  Ben Bolker

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