create.capt: Creating capture history object.
In b-steve/admbsecr: SECR models with supplementary location information

Creates a capture history object to use with the function admbsecr.

1	create.capt(captures, n.traps = NULL)

`captures`	A data frame of capture records, see 'Details' for the correct format.
`n.traps`	The total number of traps. If `NULL` then the number of traps is assumed to be the largest value in the `traps` column of the `captures` argument.

The captures argument to this function is intended to be of a similar format to the captures argument to make.capthist in the secr package. That is, users can use the same captures data frame with create.capt and make.capthist, which generate capture histories for use with the admbsecr and secr packages respectively.

As such, the second and fourth columns should provide the ID of the detection and the trap number of the trap which made the detection (where the trap number is the row number of the corresponding trap in the matrix of trap locations). Note that the first and third columns provide the 'session' and 'occassion' of the detection for make.capthist, but as the admbsecr package does not presently have the capabilities to deal with multi-session or multi-occassion data, these columns are ignored by create.capt.

Additional optional columns can specify the additional information collected over the course of the survey:

A column named bearing containing estimated bearings from which the detector detected the individual.
A column named dist containing the estimated distance between the individual detected and the detector.
A column named ss containing the measured signal strengh of the detected acoustic signal (only possible when detectors are microphones).
A column named toa containing the measured time of arrival (in seconds) since the start of the survey (or some other reference time) of the detected acoustic signal (only possible when the detectors are microphones).
A column named mrds containing the known (not estimated) distance between the individual detected and the detector.