HP 15c - Manual (Page 198)

198 Section 14: Numerical Integration
Keystrokes Display
[ 002– 23 Calculate sin θ .
- 003– 30 Since a value of θ will be
placed into the Y-register by
the f algorithm before it
executes this subroutine, the
- operation at this point
will calculate
(
θ – sin θ ).
\ 004– 24 Calculate cos ( θ – sin θ ).
|n 005– 43 32
In Run mode, key the limits of integration into the X- and Y-registers. Be
sure that the trigonometric mode is set to Radians, then press ´f 1 to
calculate the integral. Finally, multiply the integral by 1/π to calculate
J
1
(1).
Keystrokes Display
|¥
Run mode.
0
v 0.0000
Key lower limit into
Y-register.
| $ 3.1416
Key upper limit into
X-register.
| R 3.1416
(If not already in
Radians mode.)
´f 1 1.3825
|$ ÷ 0.4401
J
1
(1).
Example: Certain problems in
communications theory (for example, pulse
transmission through idealized networks)
require calculating an integral (sometimes
called the sine integral) of the form


t
dx
x
x
t Si
0
) sin(
) ( .