Returns the first or last parts of secr objects
# S3 method for mask
head(x, n=6L, ...)
# S3 method for Dsurface
head(x, n=6L, ...)
# S3 method for traps
head(x, n=6L, ...)
# S3 method for capthist
head(x, n=6L, ...)
# S3 method for mask
tail(x, n=6L, ...)
# S3 method for Dsurface
tail(x, n=6L, ...)
# S3 method for traps
tail(x, n=6L, ...)
# S3 method for capthist
tail(x, n=6L, ...)
An object of the same class as x, but (usually) fewer rows.
`mask', `traps' or `capthist' object
a single integer. If positive, size for the resulting object: number of elements for a vector (including lists), rows for a matrix or data frame or lines for a function. If negative, all but the n last/first number of elements of x.
other arguments passed to subset
These custom S3 methods retain the class of the target object, unlike the default methods applied to `mask', `Dsurface', `traps' or `capthist' objects.