[R] "Reversal" of Aggregation

From: Roland Rau <roland.rproject_at_gmail.com>
Date: Mon 29 Jan 2007 - 21:58:42 GMT

Dear all,

given I have a data.frame in a format like this

mydf <- data.frame(age=rep(1:3,5),

                   year=c(rep(1996,3), rep(1997,3), rep(1998,3),
                     rep(1999,3), rep(2000,3)),


Now I convert it to some 2D-frequency table like this: mymatrix <- tapply(X=mydf$income, INDEX=list(mydf$age, mydf$year),



My question is:
How can I go the opposite way, i.e. from 'mymatrix' to 'mydf'? Is there an elegant way?


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