delta

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Post Function: [delta]

i.e., Subtracts the previous row from the current row.

First row is NULL

Use this function to:

delta = Row(X) - Row(X-1)

Row(X) = value for current row
Row(X-1) = value for previous row
delta= Row(X) - Row(X-1)

Component	Description
Dimensions	Discrete field(s). All fields must come from the same table.
Name	Name to be displayed as Column Header in result grid
Measure	The field to be used in the post-function calculation. Must be numeric if Function is anything other than COUNT. Must come from same table as DIMENSIONS. Supports Discrete or Continuous DataTypes.
Function	COUNT / SUM / AVG / MIN / MAX / STDEV
Post	delta
*Value*	Optional. Filter to apply when evaluating FUNCTION. Only records in the Filter Recordset will be included in the Function and Post-Function calculations. Must come from same table as DIMENSION/MEASURE or be linked to the Dimension table.
*Axis*	0 / 1. Y-Axis to use when plotting graph. Default = 0
*Plot*	Y / N. Specifies whether measure’s output column should be plotted on graph. Default = Y
*Resolve*	Optional. Resolve level for the measure. If blank, Resolve = Dimension Table
*Series Type*	Default / Bar / Stacked Bar / Line / Spline / RangeLow / RangeHigh / CSLow / CSHigh / CSOpen / CSClose Determines the graph style for the measure.
*Popup*	Default / None / Extended
*Prefix*	$ / £ / E / %

To return the first row as 0.00 use the zdelta function instead.

Can be used with multiple dimensions as calculates difference between each row.

If more than one dimension is used, the order in which the dimensions are specified is important as this will affect the inter-row calculations.

The sort order of the data will also affect the calculation. Sort by Label or Value, Ascending or Descending.

Note

Measure 1 is included purely for illustration. It is not necessary to include this measure for the calculation to work.

Dimension(s):	[transactions].[yearmonth]
Measure 1	Name: =Sales This Month Measure: = transactions.castprice Function: =sum Post: = Value: =	Axis: =0 Plot:=Y Resolve:= Series Type:=Default Popup:=Default Prefix:=
Measure 2	Name: =Monthly Change Measure: =transactions.castprice Function: =sum Post: =delta Value: =	Axis: =0 Plot:=Y Resolve:= Series Type:=Default Popup:=Default Prefix:=

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