Re: [R] Creating a new column with the number of the observation

solution) and DF1 > str(DF) > str(DF1) > > > Andrija > > > > > > On Thu, May 29, 2014 at 12:03 AM, Andrija Djurovic >wrote: > > > Hi. Here is one approach: > > > > x <- rep(c("A", "B", "C"), c(3,1,2)) >

Re: [R] Creating a new column with the number of the observation

("A", "B", "C"), c(3,1,2)) >> DF <- data.frame(x, stringsAsFactors=FALSE) >> cbind(DF, new_c=c(lapply(rle(DF$x)[[1]], function(x) 1:x), recursive=T)) >> >> Andrija >> >> >> On Wed, May 28, 2014 at 10:46 PM, Marcos Santos

[R] Creating a new column with the number of the observation

I have a "data frame" like this: Category Observed_value A 100 A 130 A 140 B 90 C 80 D 120 D 130 I need to create an index column that show the number of the observation for each category. I have three observations in the category A, one in category B, one in category C and two in catego