Hello,
Is it safe to use tapply when the result will be of dim 20000
x 10000 or more ? In my PC R crashes. The code used was on a 3-col
data frame with two factor cols and a numeric column. The fn was diff
.
data form being <A, B, Num>
tapply(data$A, list(data$A, data$B), diff)
A. Mani Member, Cal. Math. Soc