HP HP-15C Advanced Functions Handbook

92 Section 3: Calculating in Complex Mode
Keystrokes
us
SB
|RCL|5
H
Display
048- 33
049- 4231 Displays yk.
050- 44 3 Stores yk in R3.
44 11 Sets ah . i 9 = v/
051u
052-
053-
22 2 Branch fork + Kn
(A isn't full).
22 0 Branch for k + 1 = n
(A is full).
054-42,21, 3 Function subroutine for
|SOLVE |.
055- 45 6 Recalls xk.
056- 34 Restores current estimate
fory*.
057- 42 25 Creates estimate
zk = xk + iyk.
058- 3212 Calculates lm(P(zk)) (or
Re(P(zk))for
equipotential lines).
059- 45 5 Recalls c.
060- 30 Calculates lm(P(zk)) - c.
061- 4332
Labels used: A, B, 0,1, 2, 3, and 4.
Registers used: R0, R1; R2 (x0), R3 (y0), R4 (h), R5 (c), R6 (xk), and
Index register (k).
Matrix used: A.
One special feature of this program is that if an x^ value lies
beyond the domain of the streamline (so that there is no root for
I SOLVE | to find), then the step size is decreased so that x^
approaches the boundary where the streamline turns back. This
feature is useful for determining the nature of the streamline when
y^ isn't a single-valued function of xk. If h is small enough, the
values of zk will lie on one branch of the streamline and approach
the boundary. (The second example below illustrates this feature.)

HP HP-15C Specifications

General

Brand	HP
Model	HP-15C
Category	Calculator
Language	English