It supposes you can type commands to a command-line interface. You are invited to type the examples as you read this tutorial and to experiment on your own. For a more systematic description of LME, please consult the LME Reference chapter. In this chapter, what the user types is displayed in bold . Simple operations LME interprets what you type at the command prompt and displays the result unless you end the command with a semicolon.
Simple expressions follow the syntactic rules of many programming languages.
32 LME has many mathematical functions. Trigonometric functions assume that angles are expressed in radians, and sqrt denotes the square root. In many computer languages, the square root is defined only for nonnegative arguments. However, it is extremely useful to extend the set of numbers to remove this limitation. It should be mentioned that i , the symbol used by mathematicians, is called j by engineers.