Sharp EL-9900 - Manual (Page 73)

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Chapter 4: Basic Graphing Features — Basic Keyboard
f: The graph appearance can be set and verified under this menu.
Press @ f to access.
A – – – – – – Displays the current FORMAT settings. The default
setting is:
OFF (for the graph equation to be displayed
on the graph)
OFF (for displaying numeric derivatives on
the graph)
ON (for displaying the X/Y axis on the
graph)
OFF (for displaying a grid on the graph)
B EXPRES This sets whether or not graph equations are displayed
on the graph screen (in the trace mode, etc.). To
display the equations on the graph, select 1 ON by
pressing 1 at this menu item.
C Y’ The numeric derivative (dx/dy) can be displayed on the
graph screen (in the trace mode, etc.). To activate this
function, select 1 ON by pressing 1 at this menu
item.
D AXIS The graph axis can be set invisible with this menu item.
To hide the X/Y axis of the graph, select 2 OFF by
pressing 2 at this menu item.
E GRID The graph display can be backed with an X-Y grid. To
show the grid on the graph, select 1 ON by pressing
1 at this menu item.
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.
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