set_attribute: Add a set attribute activity
Description
Modify an attribute in the form of a key/value pair.
Usage
set_attribute(.trj, key, value, global = FALSE)
Arguments
key
the attribute key (coerced to a string).
value
the value to set, accepts either a numeric or a callable object
(a function) which must return a numeric.
global
if TRUE
, the attribute will be global instead of per-arrival.
Value
Returns the trajectory object.