Hi. I am new to R and actually have several questions related to this topic. A row in my data looks like the following: 418 12 6/21/2010 9:37:12 40.7219593 -73.9962579 1.3406345525960568 0.019682641058810173 In order, the columns are id, week, date, time, latitude, longitude, heading and displacement (no actual header though). I would like to read in the date, time, heading and displacement from a file. I would like to combine date and time into a single DateTime object. Then, I would like to do two things: (1) view a 3d scatterplot of DateTime, heading and displacement and (2) do an autoregression for heading indexed by DateTime. Thanks for any help. Regards, Keith -- View this message in context: http://r.789695.n4.nabble.com/Time-Series-w-Unequal-Time-Steps-tp4080562p4080562.html Sent from the R help mailing list archive at Nabble.com.