Hello Serge Steer As you suggested, x(3)-y = - 1.388D-17. I must improve to genarate values of x. Thanks a lot. Best regards. -- View this message in context: http://mailinglists.scilab.org/find-function-failure-in-scilab6-tp4032767p4032769.html Sent from the Scilab users - Mailing Lists Archives mailing list archive at Nabble.com.