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