LEXIBOOK GC1000i, Инструкция по эксплуатации, Страница: 46 / 75

3.2.7 Line function
The Line function makes it possible to connect two points (including the blinking pointer) created with the
Plot function with a straight line. With this function, user generated lines can be added to graphs to make
them easier to read.
Example: draw perpendiculars from point (2,0) on the x-axis to its intersection with the graph
for y=3x. Then draw a line from the point of intersection to the y-axis.
The range values for the graph are as follows:
Xmin
: -2 Ymin : -2
Xmax : 5 Ymax : 10
Xscl : 1 Yscl : 2
Clear the graph display and draw the graph for y=3x.
3
Next, use the Plot function to locate a point at (2,0)
2 0
Now plot a point at (2,0) again and use the cursor key (
→
)to move the pointer up to the point on the point
on the graph (y=3x).
2 0
~
(Move the pointer up to the point on the graph for y=3x.)
Draw a line using the Line function.
Next, a perpendicular will be drawn from the same point on the graph to the y-axis. First, plot the
point on the graph and use the cursor key to move the pointer to the y-axis. This can be
accomplished using Plot X, Y since the x-y coordinates of the point on the graph are stored in the X
and Y memories.
~
(Move the pointer to the y-axis)
*** The Line function can only be used to draw lines between the blinking pointer and a fixed point
created using the Plot function.
3.2.8 Graph scroll function
Immediately after you have drawn a graph, you can scroll it on the display. Use the cursor keys to scroll
the graph left, right, up and down.
To scroll the graph on the display
Example: To draw the graph for y=0.25 (x+2) (2x+1) (2x-5), y=2x-3, and then scroll it.
Xmin : -5 Ymin : -8
Xmax : 5 Ymax : 8
Xscl : 1 Yscl : 2
- 46 -
Copyright L
EXIBOOK
2002
GB
Graph
EXE X ALPHA
EXE
SHIFT Cls
EXE SHIFT Line
EXE SHIFT Line
Plot SHIFT EXE SHIFT
,
Plot
SHIFT EXE SHIFT
,
EXE Y ALPHA
,
Plot
SHIFT
SHIFT
X ALPHA
EXE Y ALPHA
,
Plot
SHIFT
SHIFT
X ALPHA