Ed L Cashin <[EMAIL PROTECTED]> writes: > Douglas Bates <[EMAIL PROTECTED]> writes: > > ... > > The point is that factor(paste(...)) returns a factor with length of > > nrow(d) and with factor levels determined by the combination of levels > > of a and b (provided that you don't get ambiguities as described > > above). The split function does not require that the factor > > determining the splits be part of the data frame being split. It can > > be given explicitly as it is here. > > I think I need to look at the source of split when I have more time.
?split is probably a better place to start. > > [1] If you really want to be cautious you could use an octal > > representation like sep="\007" to get a character that is very > > unlikely to occur in a factor level. > > I definitely want to be cautious. Instead of the bell character I > think I'll use the field separator character, "\034", just because > this is the first time I've been able to use it for it's intended > purpose! ;) Yes, but with "\034" you don't get to make obscure James Bond references :-). ______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
