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    Exponential Average
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    EXPAVG(arg1; weight)
    The 'arg1' parameter must be an array.
    The 'weight' parameter is the exponential weight - a constant between 0 and 1.
    The result is an array.

    The function calculates the exponential average of the input array. The formula is:

    Result[n] = arg1[n] * weight + arg1[n-1] * (1 - weight)

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