Previous Value of Function (Variable Length) [PrevVL]

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The Previous Value of Function (Variable Length) function returns the value of the containing function a varying number of bars ago. Parameters ------------------ Period          The number of bars of data to include in the calculation, not including the current bar.                     For example, a period of 1 returns the value from the previous bar. Maximum Period   The maximum value that Period can contain.                              Larger values require extra memory to be set aside for this function to be calculated. Function Value ------------------------ This function returns the previous value of the function it is included in. If the previous value is not defined, this function returns 0. If the period is greater than the maximum period or negative, the value is not defined. If the period contains a fractional number, only the integer portion will be used. Usage ---------- Variable length functions can be used in association with other calculations, such as "Bars Since" functions, to determine values since an event occurred. For example, the following formula would return the value of the containing function at the time of the highest high in the last ten bars: PrevVL ( BarsSinceHigh ( High, 10 ) , 10) Since Previous Value of Function can only be used within other functions, it is only available from within the formula editor.