Chapter 11. Other Useful Excel Functions
In this chapter, I selectively cover Excel's Mathematical, Date and Time, and Text functions that you are likely to use. Excel has many more functions in these categories, which you can look up as necessary.
For a general discussion on Excel's functions and how to learn and use them, see the chapter on advanced Excel features.
In addition to the functions I discuss here, this category includes a complete set of trigoNametric functions and several functions for doing matrix calculations and calculations with arrays. I do not discuss them here because you are not likely to use them much.
TRUNCATING AND ROUNDING NUMBERS
Excel provides several functions for truncating and rounding numbers. The differences among some of them are subtle, and the way they work on negative numbers may be different from what you expect. Be careful about choosing the right function for your application; if in doubt, experiment to make sure you understand how a function will handle negative arguments.
Rounds a number to the specified number of digits (the second argument). This function follows the standard mathematical definition of rounding.
ROUND(1.36,l) equals 1.4.
ROUND(−1.36,1) equals −1.4.
Rounds a number away from zero to the specified number of digits.
ROUNDUP( 1.34,1) equals 1.4.
ROUNDUP(-1.34,1) equals −1.4.
Rounds a number toward zero to the specified number of digits.
ROUNDDOWN(l.36,1) equals 1.3.
ROUNDDOWN(-1.36,1) equals ...