Enables function graphing mode.

Func

While editing a program, press:

- MODE to access the mode menu.
- Use arrows to select Func.

TI-83/84/+/SE/CE

1 byte

The `Func` command enables the default function graphing mode. This command is usually unnecessary in a program, but if you want to graph a Y= equation, you'd want to make sure the calculator is in function mode first.

In function mode, you can graph equations where *y* (the vertical coordinate) is a function of *x* (the horizontal coordinate). This mode is most commonly discussed in algebra and single-variable calculus courses. Many curves, such as a parabola, have simple expressions when written in the form *y=f(x)*.

However, in function mode, many expressions cannot be graphed at all. For example, a circle can't be easily graphed in function mode, since for some *x*-values, there are two *y*-values. Using two functions, you can achieve a circle, but it will still require a friendly graphing window to display perfectly.

Many calculator features are specifically targeted at function mode graphing. For example, two graphing styles (see `GraphStyle(`) can be only used with function mode. The `DrawF` and `DrawInv` commands draw functions as if in graphing mode.

# Advanced Uses

The window variables that apply to function mode are:

`Xmin`— Determines the minimum X-value shown on the screen.`Xmax`— Determines the maximum X-value shown on the screen.`Xscl`— Determines the horizontal space between marks on the X-axis in`AxesOn`mode or dots in`GridOn`mode.`Ymin`— Determines the minimum Y-value shown on the screen.`Ymax`— Determines the maximum Y-value shown on the screen.`Yscl`— Determines the vertical space between marks on the Y-axis in`AxesOn`mode or dots in`GridOn`mode.`Xres`— Determines the pixel distance between points used for graphing. This is a value 1-8: 1 for best quality, 8 for best speed.

# Related Commands

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