Sharp EL-9900 User Manual

Page 67

Chapter 4: Basic Graphing Features — Basic Keyboard

Press this button to trace the graph drawn on the screen, to

obtain the X-Y coordinates:

1. While the graph is displayed,

press the

U key. The

cursor appears, flashing on

the graph line, with the

present X-Y coordinates.

2. Trace the graph using the

; or ' keys. The ; key

decreases the value of x, while the

' key increases it.

3. Pressing the

U key again will redraw the graph, with the

cursor at the center of the screen. If the cursor is moved

beyond the range of the screen, pressing the

U key will

redraw the screen centered around the cursor.

4. When done, press the

C key to escape the tracing

function.

If more than one graph is displayed on the screen, use the

{

} keys to switch the cursor from one graph to the other.

Note:

If the

U key is not activated, the cursor will not be bound to

the graph. Pressing the

;, ', {, or } keys will

position the free-moving flashing cursor on the graph display.

Displays the graph window setup. The setup values — the

minimum/maximum X/Y values, and X/Y-axis scale — can be

changed manually:

1. While the graph is displayed

on the screen, press the
W key. The following
window appears, with the

cursor set at “Xmin=”.

2. The required X-minimum value can be entered here. This

limits the left boundary of the graph window. For example, if

“Xmin=” is set to “0”, then the portion of the graph’s Y-axis to

the left will not be displayed.

3. Once the “Xmin=” value is entered (“0”, for example), press

E. The left limit of the graph is now set, and the cursor
moves to “Xmax=”.