Defining and entering functions

1.    From the Home Screen select the Function Editor icon or press c to display the Y= editor.

2.    Press the down arrow ≥ to move the cursor to the function you want to define or edit.

3.    Press q to erase a function.

4.    Enter or edit the expression to define the function.

• You may use functions and variables (including matrices and lists) in the expression. When the expression evaluates to a nonreal number, the value is not plotted; no error is returned.
• You can access the shortcut menus by pressing b Ü - Ž.
• In function mode the independent variable in the function is X. Func mode defines l as X. To enter X, press l or press b X.
• When you enter the first character, the = is highlighted, indicating that the function is active.
• As you enter the expression, it is stored to the variable Yn as a user-defined function in the Y= editor.

5.    Press = or the down arrow ≥ to move the cursor to the next function.

Setting up the viewing window for a graph

When a function is entered in the Y= editor, you can view a table of values by pressing a Ä. 

Note: The table setup, a Ä, determines how table values are displayed. Check the table setup values if the table results are not in expected format of fraction. Using a mix of decimal and fractions will not retain fractions.

Setting up the formatting options for the graph space

Press a  to access all the graph formatting options. This menu includes the options for points of interest trace, grid and background color.

Viewing and using the table

When a function is entered in the Y= editor, you can view a table of values by pressing a Ä.

Note: The table setup, a Á, determines how table values are displayed. Check the table setup values if the table results are not in expected fraction format. Using a mix of decimal and fractions will not retain fractions.