258 Appendix E: A Detailed Look at f
If any other program line is displayed, return to Run mode and
single-step (Â) through the program until you reach a n
instruction (keycode 43 32) or line 000 (if there is no n).
(Be sure to hold the  key down long enough to view the
program line numbers and keycodes.)
3. Press | K to view the current approximation. If you want to
continue calculating the final approximation, press − + ¦.
This refills the stack with the current x-value and restarts the
calculator.
For Advanced Information
The HP 15c Advanced Functions Handbook explores more esoteric aspects
of f and its applications. These topics include:
Accuracy of the function to be integrated.
Shortening calculation time.
Calculating difficult integrals.
Using f in Complex mode.