Using The Catalog - Texas Instruments TI-83 Series Manual

Õ to highlight that item. To enter numbers in the
other options, edit the existing number or press ë
and use the keypad to enter a new number. When you are
finished setting the clock, save your settings by placing
the cursor on SAVE and pressing Õ.
If you're planning on graphing trigonometric functions, put
the calculator in Radian mode. Reason: Most trig functions are
graphed for -2π ≤ x ≤ 2π. That is approximately –6.28 ≤ x ≤ 6.28.
That's not a bad value for the limits on the x-axis. But if you
graph in Degree mode, you would need –360 ≤ x ≤ 360 for the
limits on the x-axis. This is doable . . . but trust me, it's easier
to graph in Radian mode.
If your calculator is in Radian mode and you want to enter an
angle in degrees, Chapter 3 tells you how to do so without
resetting the mode.

Using the Catalog

The calculator's Catalog houses every command and function
used by the calculator. However, it's easier to use the keyboard
and the menus to access these commands and functions than it
is to use the Catalog. There are several exceptions; for example,
the hyperbolic functions are found only in the Catalog. If you
have to use the Catalog, here's how to do it:
1. If necessary, use ~|}Ü to place the cursor at the
2. Press y) to enter the Catalog.
3. Enter the first letter in the name of the command or
location where you want to insert a command or
function found in the Catalog.
The command or function is usually inserted on the
Home screen, or in the Y= editor when you're defining
a function you plan to graph.
This is illustrated in the first picture in Figure 1-4.
function.
Notice that the calculator is already in Alpha mode, as is
indicated by the ÿ in the upper-right part of the screen.
To enter the letter, all you have to do is press the key
corresponding to that letter. For example, if you're using
the Catalog to access the hyperbolic function tanh,
Chapter 1: Coping with the Basics
15