[R] grouping and counting in dataframe

[zem]

hi all,

i have a little problem, i have some code writen, but it is to slow... 

i have a dataframe with a column of time series and a grouping column,
really there is no metter if in the first col what kind of data is, it can
be a random number like this
x<-rnorm(10)
gr<-c(1,3,1,2,2,4,2,3,3,3)
x<-cbind(x,gr)

now i have to look for every row i , for this group, how much from the x[,1]
is in a range from x[1,i] such x[1,i] (+/-) k (k is a another number) 

thanks in advance 

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