Sharp EL-9900 - Manual (Page 74)

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Chapter 4: Basic Graphing Features — Basic Keyboard
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.
If independent memories A to C contain any numeric values,
the graph is drawn based on these values.
* If the equation (in this example, Y1) on which the cursor is
located contains no variables, the substitution feature screen
will not appear.
• 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 subse-
quent steps.
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.