1  | mat2grp(m, coln)
 | 
m | 
|
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  | ##---- 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, coln) 
{
    if (!is.null(dim(m))) 
        m = as.matrix(m)
    if (!is.matrix(m)) 
        stop("Data must be stored in a matrix or data frame")
    if (length(coln) != 1) 
        stop("The argument coln must have length 1")
    x <- list()
    flagna = !is.na(m[, coln])
    m = m[flagna, ]
    grpn <- sort(unique(m[, coln]))
    for (ig in 1:length(grpn)) {
        flag <- (m[, coln] == grpn[ig])
        x[[ig]] <- m[flag, ]
    }
    print("Group Levels:")
    print(grpn)
    x
  }
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