Sharp el-9950

113
Chapter 4: Graphing Features
Example
Substitutenumericvaluesundertheconditionsthat“Y1=AX
2
+
BX
+
C”and“Y2=AX”havebeeninput.
Equation Entry screen
The cursor pointer is located at
Y1.DrawingofbothgraphsY1
andY2isvalid.
1. Press
@
,
.
The substitution feature
screen will appear. The
equation on which the cursor
pointer is located and its
variables are displayed on
the right of the screen.
If variables (characters) contain no values, the graph is not
drawn.
Substitution feature
• Thesubstitutionfeatureallowsyoutoinputanequationusingcharactersand
variables, and then substitute numeric values for the characters to draw the graph.
• Thesubstitutionfeatureisvalidonlyintherectangularcoordinatesystem.
Using this feature, any number of numeric value sets can be substituted while
referring to the graph drawing screen. This clearly shows the changes in the graph
depending on numeric values.
Forexample,thegraphfor“Y1=AX
3
+
BX
2
+
CX
2
–
D”isdrawnbysubstituting
numericvaluesforvariablesA,B,C,andDoftheequation.
• 22kindsofvariables(characters),AtoZexceptforR,T,X,andYcanbeusedforthe
substitution feature.
• Uptosevenvariables(characters)canbeusedforoneequation.(Iftheequation
contains more than seven variables (characters), up to seven characters from the top
of the equation are determined as variables and subsequent characters are ignored.)
• Ifyouattempttoexecuteanequationcontainingnovariables,thesubstitutionfeature
becomesinvalidandtheerrormessage,“NOVARIABLE”,appearsonthescreen.
•
To input the equation, there are the following two methods after
Y
has been
pressed.Aftertheequationhasbeeninput,thesameoperationsapplytosubsequent
steps.