HP HP-15C

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
          
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
tSi
0
)sin(
)(
.