*Mathematica* Basics—Functions
### Introduction
In this notebook we will look at how you as the user can create *your
own* functions in *Mathematica*. Some of your work may remind you of the
work you did back in the Variables notebook when you
learned the differences between **immediate** and **delayed assignment**,
(i.e. the differences between = and :=). In
fact, if you're still a little confused on these issues it might pay you to go back there now, and review them.
**Note**: In order to see exactly how functions behave we're going to
begin the notebook by making some *deliberate mistakes*. Don't
panic if you generate an error message, or an answer
that seems incorrect—read on to the next question. Unless you managed to create
a brand new mistake of your own, you should find an explanation following each
of these little difficulties.
#### Evaluating Commands
Remember, as we said in the introduction to the first 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. Again, don't confuse this with the RETURN key, which merely
starts a new line of text.
You can now switch to an actual *Mathematica* practice notebook by
clicking on the icon on the left. It may take a while to start up! Don't forget to come back
here when you're done! (You can also return here just to reread the instructions.) See you in a few
minutes.
Welcome back! You may be wondering how well you did. Click on the icon on the left to see the answers you should have gotten. (Only the answers are given, so if you don't match our results you need to figure out what you did wrong.)
You're now done with this lab. Next you may go to the Table of Contents for the *Mathematica* Basics Labs, or go to the Table of Contents for all of the Differential Equations
Labs, or simply quit. |