HP -15C Advanced Functions Handbook page 24

22 Section 1:
Keystrokes
E
nnrRtNi
rnrLBUirBi
[cos]
[RCL|O
E
|cos|
[RCTIl
B
[TiTI
[SJNl
B
[RCLJ2
E
nnfRTNi
Using [SOLVE |
Display
020-
021-
022-42
023-
024-
025-
026-
027-
028-
029-
030-
031-
032-
033-
034-
Effectively
10
43 32
,21,12 S
24
45 0
20
24
45 1
30
34
23
10
45 2
20
43 32
Subroutine for E(ff).
In the previous example, the calculator was set to Radians mode
and the three constants were stored in registers R
0
, RI, and R
2
. Key
in the same initial estimates as before and execute I SOLVE I .
Keystrokes
I ENTER || ENTER
Display
0.1745
1.0472
0.4899
0.0000
0.4899
-0.2043
0.4899
28.0679
Run mode.
Initial estimates.
Angle given zero slope.
Slope at specified angle.
Restores the stack.
Uses function subroutine
to calculate minimum
intensity.
Recalls 6 value.
Angle in degrees.
This numerical approximation of the derivative indicates a
minimum field intensity of -0.2043 at an angle of 28.0679°. (This
angle differs from the previous solution by 0.0001°.)