delayInformation is the system dynamics function that returns the value of the input delayed by the delay time.
The initial value is the value of the variable on the left-hand side
of the equation at the start of the simulation. The delay time can be a
variable. If delay time is decreasing some values of the input will be
discarded and replaced by more recent inputs. If delay time is
increasing existing values will be held.
delayInformation can be called in formulas of system dynamics variables.
delayInformation function has the following notation:
input - can be a flow variable, or a numeric expression of any complexity.
delayTime - can be either a constant or a numeric expression (e.g. a function call, or a numeric parameter).
initialValue - initial value.
delayTime -> time
initialValue -> unit
delayInformation() -> unit
The output units are the same as the input ones.