Dear R forum
I have following data.frame
dat = data.frame(key = c(A, B, C, D, E, E), id = c(instru_A,
instru_B, instru_B, instru_B, instru_C, instru_C), price = c(101.38,
3.9306, 3.7488, 92.9624, 5.15, 96.1908), adj_factor = c(2.08, 2.5217, 2.5217,
2.5217, 3.08, 3.08))
dat
key id
Hi,
Try:
indx - as.vector(with(dat,tapply(seq_along(price), list(id), FUN= head,1)))
dat$adjusted_price - dat$price
dat$adjusted_price[indx] - with(dat, price[indx]-adj_factor[indx])
dat
# key idprice adj_factor adjusted_price
#1 A instru_A 101.3800 2.080099.3000
#2
Hello,
Try the following.
fun - function(x){
x[[adjusted_price]] - x[[price]]
x[[adjusted_price]][1] - x[[price]][1] - x[[adj_factor]][1]
x
}
res - do.call(rbind, lapply(split(dat, dat$id), fun))
rownames(res) - NULL
res
Hope this helps,
Rui Barradas
Em 07-04-2014
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