Chapter 6: Read-Only Variables
FRED includes several read-only variables that cannot be directly modified by an agent. Read-only variables can be either shared or agent-specific in scope.
Agent Read-Only Variables
Agent read-only variables may evaluate to different quantities depending on the agent. These read-only variables fall into the following categories:
demographics
id
– evaluates to an agent’s unique integer ID.age
– evaluates to the integer part of an agent’s age.birth_year
– evaluates to the four digit year of the agent’s birth.age_in_days
– evaluates to integer number of days since an agent’s assigned the agent’s assigned birthdate.age_in_years
– evaluates to an agent’s age in years computed asage_in_days / 365.25)
.real_age
– a synonym forage_in_years
.
groups
<group_name>
– evaluates to the agent’s mixing group ID for the given group type name or-1
if no such group exists.