r - aggregate and transform a dataset -


i have sample dataset following:

df=data.frame(iter=c(1, 1, 2, 2), exp=c("a", "b", "a", "b"),        val=c(2.3, 3.6, 4.0, 5.0))

the tabular form be:

  iter exp val     1    2.3     1   b  3.6     2    4.0     2   b  5.0

i trying transform in way group , b, add ratio column value such df$val[1]/df$val[2], df$val[3]/df$val[4], end result looks like:

   iter ratio    1    2.3/3.6    2    4.0/5.0

i feel should job of ddply, couldn't see path done. appreciated.

try this:

library(plyr) df2 <- ddply(df, .(iter), summarise, ratio=paste(val[which(exp=="a")],"/",val[which(exp=="b")],sep=""))

which gave me:

  iter   ratio      1 2.3/3.6      2     4/5

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