Hello, i'm pretty new on R and i'm sure the problem i have is easy to fix. my data table looks like 223344 556677.3 123455 665545.3 ......... ............. and so one i wanna plot that table but the firts column is a time with hhmmss. So i think i have to reformat the column (and maybe give it another class ??), because when i plot the data now i have gap every "hour" because one hour has got 60 minutes and then then the hour switches to the next in my data table. We recorded magnetic field over the whole day. (125959->130000),or maybe i have to set a parameter for plot() so that my x-axis represent a time scale with the format hh:mm:ss. I searched the forum but i didn't found a solution, maybe it's too simple ...;-) Thanks Stephan -- View this message in context: http://www.nabble.com/Time-scale-x-axis%2C-Reformat-data.table-tp16120596p16120596.html Sent from the R help mailing list archive at Nabble.com.