Diagnostic daytime multiple sleep latency test (MSLT) is used to diagnose narcolepsy and to measure the degree of daytime sleepiness. It measures how quickly you fall asleep in quiet situations during the day. It also monitors how quickly and how often you enter REM sleep.
Array formulas provide a way by which Excel users can discover such useful information. To explain the power of array formulas I'll use this database. It shows sales by Seller, Product, Region, and Customer, with Quantity and Total Sales, in dollars. I named each column of data with the label shown in row 1.
You can also create a formula by using a function. For example, the formulas =SUM(A1:A2) and SUM(A1,A2) both use the SUM function to add the values in cells A1 and A2. In addition to formulas that use a single function, you can create formulas with nested functions or arrays that calculate single or multiple results.lick the cell in which you want to enter the array formula. Enter the formula that you want to use. Tip Array formulas use standard formula syntax. They all begin with an equal sign, and you can use any of the built-in Excel functions in your array formulas.