Sharp EL9900C EL-9900C - Page 73

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. 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. 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 = AX3 + BX2 + CX2 - D" is drawn by substituting numeric values for variables A, B, C, and D of the equation. 63