capthist.parts: Dissect Spatial Capture History Object
Description
Extract parts of an object of class 'capthist'.
Usage
animalID(object, names = TRUE)
occasion(object)
trap(object, names = TRUE)
alive(object)
alongtransect(object, tol = 0.01)
xy(object)
xy(object) <- value
signal(object)
signal(object) <- value
Arguments
object
a 'capthist' object
names
if FALSE the values returned are numeric indices rather
than names
tol
tolerance for snapping to transect line (m)
value
replacement value (see Details)
Value
For animalID and trap a vector of numeric or character values, one per detection.
For alive a vector of logical values, one per detection.
For occasion, a vector of numeric values, one per detection.
For xy, a dataframe with one row per detection and columns 'x' and 'y'.For signal, a numeric vector with one element per detection.
If object has multiple sessions, the result is a list with one
component per session.
Details
These functions extract data on detections, ignoring occasions when an
animal was not detected. Detections are ordered by occasion, animalID
and trap.
trap returns polygon or transect numbers if traps(object)
has detector type 'polygon' or 'transect'.
alongtransect returns the distance of each detection from the
start of the transect with which it is associated.
Replacement values must precisely match object in number of
detections and in their order. xy<- expects a dataframe of x and y
coordinates for points of detection within a 'polygon' or 'transect'
detector.