Extract or replace the spacing attribute of a detector array or mask.
Usage
spacing(object, ...)
spacing(object) <- value
Arguments
object
object with `spacing' attribute e.g. traps
value
numeric value for spacing
...
other arguments (not used)
Value
scalar numeric value of mean spacing, or a vector if object has multiple sessions
Details
The `spacing' attribute of a detector array is the average distance from
one detector to the nearest other detector.
The attribute was not always set by make.grid() and
read.traps() in versions of secr before 1.5.0. If the
attribute is found to be NULL then spacing will compute it on the
fly.