lxy.subset: Take a subset of a LoCoH-xy object
In tlocoh: Constructs homeranges and explores time use patterns from location data

Returns a subset of a LoCoH-xy object based on the id, ptid, idx, or dates

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lxy.subset(lxy, id = NULL, ptid = NULL, idx = NULL,
  dt.start = NULL, dt.end = NULL, dt.int.round.to = 0.1,
  tau.diff.max = 0.02)

`lxy`	A LoCoH-xy object
`id`	The id value(s) to include in the subset
`ptid`	A vector of ptid values for the subset of points
`idx`	A vector of indices for the subset of points
`dt.start`	A starting date for the subset. POSIXct object (or something that can be coered to POSIXct)
`dt.end`	An ending date for the subset. POSIXct object (or something that can be coered to POSIXct)
`dt.int.round.to`	The proportion of the median sampling frequency that time intervals will be rounded to when computing the frequency table of sampling intervals (no change is made to the time stamps)
`tau.diff.max`	The maximum deviation from tau (expressed as a proportion of tau) that a point-to-point time difference must fall within for the point-to-point distance to be included in the calculation of the median step length