1  | selby(m, grpc, coln)
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m | 
|
grpc | 
|
coln | 
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27  | ##---- Should be DIRECTLY executable !! ----
##-- ==>  Define data, use random,
##--	or do  help(data=index)  for the standard data sets.
## The function is currently defined as
function (m, grpc, coln) 
{
    if (is.null(dim(m))) 
        stop("Data must be stored in a matrix or data frame")
    if (is.na(grpc[1])) 
        stop("The argument grpc is not specified")
    if (is.na(coln[1])) 
        stop("The argument coln is not specified")
    if (length(grpc) != 1) 
        stop("The argument grpc must have length 1")
    x <- vector("list")
    grpn <- sort(unique(m[, grpc]))
    it <- 0
    for (ig in 1:length(grpn)) {
        for (ic in 1:length(coln)) {
            it <- it + 1
            flag <- (m[, grpc] == grpn[ig])
            x[[it]] <- m[flag, coln[ic]]
        }
    }
    list(x = x, grpn = grpn)
  }
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