LEXIBOOK GC500i Instruction Manual page 40

GB
Range reset
G
Range values are reset to their initial values by pressing
The initial values are as follows.
Xmin :
Xmax :
Xscl :
(Reference)
Range settings are performed within programs using the following format:
Xmin value, Xmax value, Xscl value, Ymin value, Ymax value, Yscl value
Range
Up to six data items are programmed after the Range command. When less than six items are programmed,
range setting is performed in the order from the beginning of the above format.
3.2.2 Use generated function graphs
After performing range settings, user generated graphs can be drawn simply by entering the function
(formula) after pressing
Here, let's try drawing a graph for y=2x
Set the ranges to the values shown below.
Xmin :
Xmax :
Xscl :
Input the functional formula after pressing the
2
Graph
3
ALPHA
The result produces a visual representation of the formula.
3.2.3 Function graph overdraw
Two or more function graphs can be overdrawn, which makes it easy to determine intersection points and
solutions that satisfy all the equations.
Example: Here, let's find the intersection points of the previously used y=2x
First, clear the graph screen in preparation for the first graph.
SHIFT
2
Graph
3
ALPHA
Next, overdraw the graph for y = 2x +3
2
Graph
In this way it can be easily seen that there are two intersections for the two function graphs. The
approximate coordinates for these two intersections can be found using the Zoom function and the Trace
function described in the following section.
*** Be sure to input variable x (
overdraw.
If variable x is not included in the second formula, the second graph is produced after clearing the first
graph.
- 40 -
-3.8 Ymin
3.8 Ymax
1 Yscl
.
Graph
+3x-4.
2
-5 Ymin
5 Ymax
2 Yscl
Graph
ALPHA X x 2 EXE
4
-
X EXE
Scl EXE
ALPHA X EXE
x 2
4
-
X EXE
3
+
ALPHA X EXE
) into the formula when using built-in graphs for
ALPHA X
during range display.
SHIFT Mcl
: -2.2
: 2.2
: 1
: -10
: 10
: 4
key.
+ 3x – 4 and y= 2x +3
2
Copyright L
EXIBOOK
2002