[Gretl-users] zero values

Hi, I created an harmonic with the following command: a1=sin(pi*time) where time is a trend series. I expected a zero vector, but the program returns something which is very close to zero but not exactly, as shown in the tabulation Obs b2 1981:1 1.22461e-016 1981:2 -2.44921e-016 1981:3 3.67382e-016 ... and in the graph, which is not a straight line at y=0. I understand this is due to the numerical accuracy at which the program works, but I wonder if it's possible to set an option to show 0 whenever values are lower than a fixed level (say 10^-5). Thanks, Marco Marini Istat