MATLAB is a programming environment that was designed to closely resemble mathematical notation, and its built-in libraries cover a wide range of applications.
Use the Command Window to quickly evaluate expressions without saving them; it works like an interactive calculator that keeps a record of everything you type.
Every value you compute can be stored in a variable using the assignment operator =; MATLAB saves the result, not the formula, so changing one variable does not automatically update others.
Variable names must start with a letter, may contain letters, digits, and underscores, are case-sensitive, and cannot be MATLAB keywords; choosing descriptive names makes code far easier to read and debug.
Ending a statement with a semicolon suppresses Command Window output but still creates the variable in the workspace; use semicolons to keep intermediate results from cluttering your screen.
Commands such as clear, clc, and whos help you manage the workspace and Command Window; developing the habit of clearing the workspace before re-running commands prevents hard-to-find errors caused by stale variable values.