Define a milestone of a trial. This is a user-friendly wrapper for
the class constructor Milestones$new. Users who are not familiar with
the concept of classes may consider using this wrapper directly.
Arguments
- name
character. Name of milestone.
- when
condition to check if this milestone should be triggered.
- action
function to execute when the milestone triggers. If no action to be executed but simply need to record triggering time of a milestone,
actioncan be its default value, a built-in functiondoNothing.