HP 15c - Manual (Page 68)

68 Section 3: Calculating in Complex Mode
68
Keystrokes Display
´V 029- 42 25 Forms complex z
0
.
* 030- 20 Calculates z
0
e
ik360 / n
, root
number k.
lV 031- 45 25 Recalls number k.
® 032- 34 Places z
k
in X-registers, k in Y-
register.
1 033- 1
O+V 034-44,40,25 Increments number k in Index
register.
) 035- 33 Restores z
k
and k to X- and Y-
registers.
¦ 036- 31 Halts execution.
t0 037- 22 0 Branch for next root.
Labels used: A and 0.
Registers used: R
2
, R
3
, R
4
, and Index register.
To use this program:
1. Enter the order n into the Y-register and the complex number z into the X-registers.
2. Press ´A to calculate the principal root z
0
which placed in the real and imaginary X-
registers. (Press´% and hold to view the imaginary part).
3. To calculate higher number roots z
k
:

Press ¦ to calculate each successive higher-number root. Each root z
k
is placed in
the complex X-registers and its number k is placed in the Y-register. Between root
calculations, you can perform other calculations without disturbing this program (if
R
2
, R
3
, R
4
, and the Index register aren't changed).

Store the number of the root k in the Index register (using OV then press ¦
to calculate z
k
. The complex root and its number are placed in the X- and Y-registers,
respectively. (By pressing ¦ again, you can continue calculating higher-number
roots.)
Example: Use the previous program to compute (1)
1/100
. Calculate z
0
, z
1
, z
50
for this
expression.
Keystrokes Display
|¥
Run mode.
100 v1 1 Enters n = 100 and z = 1 (purely
real).
´A 1.0000 Calculates z
0
(real part).
´% (hold) 0.0000 Imaginary part of z
0
.