Ravi please look my last mail. I tried again, and in my last mail i described the results, i reach the convergence but the values are still very diferent. thank you so much! Lucía -- View this message in context: http://r.789695.n4.nabble.com/BFGS-and-Neldear-Mead-tp3388017p3394334.html Sent from the R help mailing list archive at Nabble.com.