Hi, is this intended? <hansl> s = "a,b" # two M = seq(1,3)' # three rnameset(M,s) # no error, "a,b" is taken as a three-char prefix print M </hansl> I can understand the logic -- it doesn't match, and so the comma loses its special meaning and the entire string is used as a kind of prefix. When using strings arrays instead as an input to rnameset, there are warning messages. Again, I can see why, because with arrays it's more obvious what's intended and what's wrong. So I'm not saying it's a bug, but still wanted to ask. thanks sven