Description
Returns the value of the previous cell of the current Metric in the iteration Dimension.
This function allows you to create single Metric iterative calculations.
For more information on how to create iterative calculations, see Iterative Calculations Within a Block Using PREVIOUS.
To fill blanks across a Metric without iteration, see also FILLFORWARD function.
Related function: FILLFORWARD
Syntax
PREVIOUS(Iteration Dimension [, Offset])Arguments
Argument | Type | Dimensions | Descriptions |
|---|---|---|---|
Iteration Dimension | Number | Any Dimension included in the Metric structure | Dimension of the current Metric to which you want to apply an offset. |
Offset | Integer or Metric | No Dimension or same as the Metric | Number of cells to offset. If you leave this argument blank, a default value of Negative offsets are ignored and considered blank. If you offset by calling a Metric, blank cells in the Metric result in PREVIOUS not being applied. Note that Metrics for offsetting can have the same or fewer Dimensions as the current Metric. |
Returns
Type | Dimensions |
|---|---|
Same as the current Metric | Same as the current Metric |
Examples
Formula | Description |
|---|---|
| Returns the value of the previous month value of the current Metric. |
| Returns the value of the current Metric cell, from two months previous. |
⚠️ Important
Sparse datasets allow for much faster computation. The PREVIOUS function can densify your model, as it adds values in its Metrics, reducing performance.
Integer offsets in PREVIOUS tend to result in faster computation speeds than offsets through a Metric.
Limitations
To avoid cell-level circular dependencies and optimize computation time, Pigment restricts the use of the PREVIOUS function in the following ways:
Iterating Dimension used with PREVIOUS has a maximum of 10,000 Items
You can use
PREVIOUS()with any Dimension, but it can’t have more than 10,000 Items.Combining Multiple Dimensions to Offset
It is not possible to combine multiple PREVIOUS() functions using different Dimensions to offset in a given formula. For example, you can’t use this formula:
PREVIOUS(Month) + PREVIOUS(Product)
However you could achieve similar results with an expression such as:PREVIOUS(Month)[SELECT: Product -1]Advanced Function Compatibility
Use of PREVIOUS with the following is not possible:IRR / XIRR/ NPV
DOUBLE_EXPONENTIAL_SMOOTHING / SIMPLE_EXPONENTIAL_SMOOTHING
FORECAST_LINEAR, FORECAST_ETS, SEASONAL_LINEAR_REGRESSION
DAYSINPERIOD, PRORATA, DAYSINPERIODWITHHOLIDAYS, PRORATAWITHHOLIDAYS
For more context around limitations of using PREVIOUS(), see Iterative Calculations Within a Block Using PREVIOUS.
See Also
Excel: no equivalent