Spectre window functions operate on the data in the output window, not on the input data.
`previous(calc("Units"), 0)` returns the Units calc from the previous row
calc "Cumulative Weight" `calc("Weight") + previous(calc("Cumulative Weight"), 0)` defines a cumulative weight column for a Dive window. The cumulative weight for the current row is the sum of the current weight column plus the cumulative weight value from the previous row.
calc "cum profit" `calc("profit") + previous(calc("cum profit"),0)` defines a cumulative profit column
calc "Cumulative Sales" `previous(calc("Cumulative Sales"), 0) + calc("Sales")` adds Sales to the last value of Cumulative Sales
- The value for the first row is the start or initial value, which is usually zero. Specifying a start value is optional.
- You can also use previous() with non-numeric expressions.
- The previous() function requires two arguments.
- Spectre 7.1 supports calculations using multiple distinct expressions involving previous().
`row_count()` returns number of rows in current window
calc "mean weight" `(1/row_count())*average(value("weight"))` returns the mean average of the summary column for the current diving dimension
add "Lab ID" `concat("Lab_",lpad(string(row_number()),10,"0"))` generates a unique key in the data set
NOTE: In order to make row_number() work properly under text-input tags with multiple inputs while building in parallel, a serial build is performed instead.
`user_property_contains("State", "Ohio")`checks if the State user property contains Ohio
`user_property_contains("column_controlled", value("prop_column")) checks if the column_controlled user property contains the value in the cBase column prop_column