Mathematica Basics--Arithmetic

Mathematica has been described by some as the world's most expensive calculator. While this description doesn't pay such a powerful program the tribute it deserves, it can certainly be treated as an on-line calculator, and that's basically what we're going to be doing in this laboratory.

The Arithmetic Commands

Now let's quickly go over the symbols used when doing basic arithmetic with Mathematica:

• + simply means plus, as you'd expect.
• - means minus.
• * means times.
• / means divide.
• ^ means raise to the power of. On the keyboard it is SHIFT-6.
• ! means factorial, as you'd expect.
• %, the percent sign, refers to the previous result. On the keyboard it is SHIFT-5.
• N[...] is a function which takes the decimal value of whatever is placed inside the brackets in place of the dots.
• Pi means the Greek letter , and has its usual mathematical meaning in Mathematica of approximately 3.14159, or the circle's circumference/diameter ratio. Mathematica is case-sensitive, so make sure you capitalize the "P". Version 3.0 of Mathematica also understands the use of the actual symbol for itself in formulas. To enter it just type OPTION-P.
• E means the base of the natural logarithm, called e in most written mathematics, and approximately 2.71828.

Note: All of Mathematica's built in functions start with a capital letter. Get used to it.

Evaluating Commands

There's one last thing you should be aware of before we dive into a real notebook. In order to tell Mathematica that you want it to actually evaluate what you have typed, hit the ENTER key over on the extreme right side of your keyboard on the numeric keypad.

Do not confuse this with the RETURN key, which merely starts a new line of text. (Mathematica commands can span many lines if you want them to.)

Well, you're about to go and do the easiest laboratory exercise of the course, so don't panic too much.

Welcome back! Hopefully everything went well. You're now finishing learning the Basics of Arithmetic in Mathematica. You may now go to the Table of Contents for the Mathematica Basics Labs, or simply quit.