beautypg.com

Setting graphing accuracy with delta x and delta y, Setting the graph format – Texas Instruments TI-86 User Manual

Page 95

background image

Chapter 5: Function Graphing

83

05FUNC.DOC TI-86, Chap 5, US English Bob Fedorisko Revised: 02/13/01 2:22 PM Printed: 02/13/01 3:01 PM Page 83 of 14

Setting Graphing Accuracy with

@

x and

@

y

The window variables

@

x

and

@

y

define the distance from the center of one pixel to the

center of any adjacent pixel. When you display a graph, the values of

@

x

and

@

y

are

calculated from

xMin

,

xMax

,

yMin

, and

yMax

using these formulas:

@

x

=(

xMin

+

xMax

)

à126

@

y

=(

yMin

+

yMax

)

à62

@

x

and

@

y

are not on the window editor. To change them, you must follow the steps above

for changing a window variable value from the home screen or in the program editor. When
you change the values stored to

@

x

and

@

y

, the TI

-86 automatically recalculates

xMax

and

yMax

from

@

x

,

xMin

,

@

y

, and

yMin

, and the new values are stored.

Setting the Graph Format

To display the graph format screen, select

FORMT

from the

GRAPH

menu (6 / (). The graph format settings

define various characteristics of the displayed graph. The
current settings are highlighted.

To change a setting, move the cursor onto the new setting,
and then press b, the same as on the mode screen.

The TI

-

86 retains

independent format settings
for each graphing mode.

In DifEq graphing mode, the
graph format screen key
sequence is

6

/

&

(Chapter 10).