If the answer to a problem is a pure integer, is it safe to set the tolerance to 0% ? Lars. -- Lars Jensen, TMCC/Vista B200, 7000 Dandini Blvd, Reno NV 89512-3999. Internet: <jensen@physics.unr.edu>, http://www.scsr.nevada.edu/~jensen Tel: 775.673.7113 FAX: 775.674.7592