[R] Time Series w/ Unequal Time Steps

[kthomp271828]

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

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