HP -15C Advanced Functions Handbook page 68

66
Section 3: Calculating the Complex Mode
Because this approximation is valid for both real arguments and
complex arguments with Re(z) > 0, this program approximates
ln(F(2)) in Complex mode (for sufficiently large \z\). When \z\ 4
(and Re(z) > 0), the approximation has about 9 or 10 accurate
digits.
Enter the following program.
Keystrokes
rglfp/Rl
FflCLEARlPRGMl
Display
Program mode.
000-
001-42
002-
003-
004-
005-
006-
007-
008-
009-42
010-
011-
012-
013-
014-42
015-
016-
017-
018-
019-
020-
021-
022-
023-
024-
025-
,21,11
6
44 25
34
36
36
36
45 6
,21, 1
40
45 24
34
10
, 5,25
22 1
45 0
40
34
30
43 36
43 12
43 36
48
5
30
Stores counter in Index
register.
Fills stack with z.
Recalls a
6
.
Loop for continued
fraction.
Recalls a,-.
Restores z.
Decrements counter.
Recalls a
0
.
Restores z.
Recalls z.
Calculates ln(2).
Recalls z.
Calculates z —
l
h.