# Display Functions in a Table on the TI-83 Plus

After you’ve entered the functions in the Y= editor, you can have the TI-83 Plus graphing calculator create a table of functional values. To create a table, perform the following steps:

Highlight the equal sign of those functions in the Y= editor that you want to appear in the table.

Only those functions in the Y= editor that are defined with a highlighted equal sign appear in the table. To highlight or un-highlight an equal sign, press

**[Y=]**, use thekeys to place the cursor on the equal sign in the definition of the function, and then press

**[ENTER]**to toggle the equal sign between highlighted and un-highlighted.Press [2nd][WINDOW] to access the Table Setup editor.

Enter a number in TblStart and then press [ENTER].

**TblStart**is the first value of the independent variable*x*to appear in the table. Here,**TblStart**is assigned the value 5.To enter the number you have chosen for

**TblStart**, place the cursor on the number appearing after the equal sign, press the number keys to enter your new number, and then press**[ENTER]**.Enter a number in

**and then press [ENTER].**gives the increment for the independent variable

*x*. Here,is assigned the value –1.

To enter the number you have chosen for

place the cursor on the number appearing after the equal sign, press the number keys to enter your new number, and then press

**[ENTER]**.Set the mode for Indpnt and Depend.

To change the mode of either

**Indpnt**or**Depend**, use thekeys to place the cursor on the desired mode, either

**Auto**or**Ask**, and then press**[ENTER]**.To have the calculator automatically generate the table for you, put both

**Indpnt**and**Depend**in**Auto**mode. This table was constructed in this fashion.If you want to create a user-defined table in which you specify which values of the independent variable

*x*appear in the table — and then have the calculator figure out the corresponding values of the functions — put**Indpnt**in**Ask**mode and**Depend**in**Auto**mode. (How you construct the table is explained in Step 6.)For a user-defined table, you don’t have to assign values to

**TblStart**andin the Table Setup editor.

The other combinations of mode settings for

**Indpnt**and**Depend**are not all that useful unless you want to play a quick round of “Guess the*y*-coordinate.”Press [2nd][GRAPH] to display the table.

When you display the table,

**Indpnt**and**Depend**in Step 5. And what you can do with the table also depends on these modes. Here’s what you see and what you can do:**An automatically generated table:**If

**Indpnt**and**Depend**are both in**Auto**mode, then when you press**[2nd][GRAPH]**,until they appear. You can repeatedly press

to display rows above the first row on the screen.

**A user-generated table:**If you put

**Indpnt**in**Ask**mode and**Depend**in**Auto**mode so that you can generate your own table; then when you display the table, it should be empty. If it’s not, clear the table.In an empty table, key in the first value of the independent variable

*x*that you want to appear in the table, and then press**[ENTER]**. The corresponding*y*-values of the functions in the table automatically appear. Key in the next value of*x*you want in the table and press**[ENTER]**, and so on. The values of*x*that you place in the first column of the table don’t have to be in any specific order, nor do they have to be between the**Xmin**and**Xmax**settings in the Window editor.

The word ERROR appearing in a table doesn’t indicate that the creator of the table has done something wrong. It indicates that either the function is undefined or the corresponding value of *x *is not a real-valued number.