HP 35s HP 35s scientific calculator - User Guide - Page 142

Keys: 8   X  Display 8 9 Description: Specifies accuracy to four decimal places. The uncertainty from the last example is still in the display. Rolls down the limits of integration from the Z- and T-registers into the X- and Y-registers. Displays the current equation. Calculates the result. Note that the uncertainty is about 1/100 as large as the uncertainty of the SCI 2 result calculated previously. Restores FIX 4 format. Restores Degrees mode. This uncertainty indicates that the result might be correct to only three decimal places. In reality, this result is accurate to seven decimal places when compared with the actual value of this integral. Since the uncertainty of a result is calculated conservatively, the calculator's approximation in most cases is more accurate than its uncertainty indicates. For More Information This chapter gives you instructions for using integration in the HP 35s over a wide range of applications. Appendix E contains more detailed information about how the algorithm for integration works, conditions that could cause incorrect results and conditions that prolong calculation time, and obtaining the current approximation to an integral. 8-8 Integrating Equations