Manual Texas Instruments TI-80 (page 87 of 235) (English)

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Function Graphing 4-13

TRACE moves the cursor from one plotted point to the next along a function.

The cursor coordinates are displayed at the bottom of the screen.

Press

to begin a trace. If the graph is not displayed

already, the TI

80 displays it. The cursor is on the first

selected function in the

list at the middle

value on the

screen. The number of the function appears at the upper right

of the display.

Note: If any

STAT PLOTS

are turned on, the TI

80 attempts to

trace the first stat plot.

Press

and

to move the cursor along the function. Each

press moves the cursor from one plotted point to the next.

Press

and

to move the cursor five plotted points

at a time. Tracing updates and displays the values of the

variables

and

. The

value is calculated from the

value;

that is,

(X)

. If the function is undefined at an

value, the

value is blank.

)

Trace cursor on the curve.

If the

value of a function is above or below the viewing

window, the cursor disappears as you move it to that portion

of the function. However, the coordinate values at the bottom

of the screen indicate the cursor coordinates.

If you trace a function off the left or right edge of the screen,

the viewing window automatically pans to the right or left.

XMIN

and

XMAX

are updated to correspond to the new

viewing window.

Note: The screen does not pan if a

STAT PLOT

is on.

While tracing, you can press

to adjust the viewing

window so that the cursor location becomes the center of a

new viewing window, even if the cursor is above or below the

display. This allows “panning” up and down. After

QuickZoom,

TRACE

is still active.

Exploring a Graph with TRACE

Beginning a

Trace

Moving along a

Function

Panning to the

Left or Right

QuickZoom

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Texas Instruments TI-80 Manual

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