HP HP-15C

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 R0, RI, and R2. 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°.)