> Solved: used round(number,12) in this case for all of the operands of > my arcsines. Not pretty, but at least VIM made it easy... You might have the same problem though: >>> round(1.000340100000325235000000235,13) 1.0003401000003 >>> round(1.000340100000325235000000235,12) 1.0003401000000001