An example of a U.S. classified document; page 13 of a United States National Security Agency report on the USS Liberty incident, partially declassified and released to the public in July 2003. The original overall classification of the page, Top Secret code word UMBRA, is shown at top and bottom.
The Data Analysis Expressions (DAX) language is a formula language that allows users to define custom calculations in calculated columns and measures. DAX includes some of the functions that are used in Excel formulas, and additional functions that are designed to work with relational data and perform dynamic aggregation.
How to use custom functions in an Add-In. 1  Select a cell. 2  Type the custom function name in formula bar. 3  Press Enter. 4  If you donÂ´t know the name of your custom function, continue to step 3. 5  Click Insert Function button. 6  Select category User Defined. 7  Select your custom function.