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.
Using a custom function. Once you've written a custom function or installed one from the add-on store, it's as easy to use as a built-in function: 1  Click the cell where you want to use the function. 2  Type an equals sign (=) followed by the function name and any input value â for example, =DOUBLE(A1) â and press Enter.o write a custom function: 1  Create or open a spreadsheet in Google Sheets. 2  Select the menu item. 3  If you are presented with a welcome screen, click Blank Project on the left to start a new project. 4  Delete any code in the script editor. 5  For the DOUBLE function above, simply copy and paste the code into the script editor.