How do you use the rounding function in MATLAB?

There are several commonly used methods for rounding in MATLAB.

1. Flooring: floor(x) returns the largest integer that is less than or equal to x.
   Example: floor(3.8) returns 3.
2. Ceil(x) rounds up to the nearest whole number that is not less than x.
   Example: Ceil(3.2) returns 4.
3. Round: round(x) returns the nearest integer to x.
   Example: round(3.7) returns 4.
4. Truncate the decimal part: fix(x) returns the largest integer not greater than x by cutting off the decimal part.
   Example: fix(3.9) returns 3.

Additionally, MATLAB also offers other rounding functions for specific needs, such as rounding towards zero (fix), rounding up to the nearest power of 2 (nextpow2), and rounding down to the nearest power of 2 (prevpow2).

All of these rounding functions can be directly entered and used in the MATLAB command window, or called in a script file or function. For example, by entering floor(3.8) in the MATLAB command window, you will get the result 3.