HP HP-15C, Руководство пользователя

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Section 14: Numerical Integration 195
In Run mode:
2. Key the lower limit of integration ( a ) into the X-register, then press
v
to lift it into the Y-register.
3. Key the upper limit of integration ( b ) in to the X-register.
4. Press
´ f
followed by the label of your subroutine.
Example: Certain problems in physics and engineering require calculating
Bessel functions. The Bessel function of the first kind of order 0 can be
expressed as


π
0
0
) sin ( cos
π
1
) ( dθ
θ
x x J
.
Find


π
0
0
) (sin cos
π
1
(1) dθ
θ
J
.
In Program mode, key in the following subroutine to evaluate the function
f(θ) = cos (sin
θ
) .
Keystrokes Display
|¥
000–
Program mode.
´
CLEAR
M
000–
Clear program memory.
´b
0
001–42,21, 0
Begin subroutine with a
b
instruction.
Subroutine assumes a
value of
θ
is in X-register.
[
002– 23
Calculate sin
θ.
\
003– 24
Calculate cos (sin
θ).
|n
004– 43 32
Now, in Run mode key the lower limit of integration into the Y-register and
the upper limit into the X-register. For this particular problem, you also
need to specify Radians mode for the trigonometric functions.