I suppose it's very simple but I can't find the way to generate a sequence of characters, e.g. from "a" to "z". Could you please help me with this? -- View this message in context: http://www.nabble.com/how-to-generate-sequence-%22a%22---%22z%22-tp15158509p15158509.html Sent from the R help mailing list archive at Nabble.com.