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smooth is the system dynamics function that returns an exponential smooth of the input.

The plot below illustrates how the function works:

smooth can be called in formulas of system dynamics variables and has two notations:

  • smooth(input, delayTime, initialValue)

    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). It should return a positive number: smooth function with zero or negative delay time returns not a number.

  • smooth(input, delayTime)

    The simplified notation of the function. Is used when the initial value is zero.


input — unit

delayTime — time

initialValue — unit

trend() — unit

The output units are the same as the input ones.

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