Sharp EL9900C EL-9900C - Page 103

Chapter 6: Advanced Graphing Features - Advanced Keyboard 3. Press the Y key to go to the Graph Equation Entry window. 4. At the first equation entry row, enter u(n - 1) + 100. When done entering, press E. 5. At the next entry row, make sure that it has the starting value "0". 6. Bring the cursor down, and clear the rest of the four rows. 7. Press G, then press Z, 1 Auto to view the graph. Two diagonal parallel lines should appear; the top line represents the n value, while the n-1 value is represented by the line below. 8. Press U to trace the graph. As ' is pressed, you will see the traced points connected with lines, indicating the comparison between the n and n-1 values. 5. The CALC Function The CALC function utilizes the entered graph equation to calculate values. In conjunction with the 4 graph coordinates, it can be called up anywhere. Note however that the CALC function will not do anything if no graph equation has been entered or specified. The following is an example that uses the previously entered polar graph equations above. 1. First, verify the graph coordinate mode by pressing @ ;; check to see if E COORD is set to Polar. If not, this will need to be changed accordingly. Also, make sure the angle unit B DRG is set to Rad. Otherwise the graph will not be drawn correctly. 93