HP 15C User Manual (English)

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HP-15C

Complex Numbers

Memory In complex mode a complex stack including Last-X register exists.

The needed five registers are allocated from the uncommitted

memory space, see MEM.

f I

-or-

Re↔Im

Automatically turns on the complex mode. Indicated by "C" in the

display. To turn off complex mode clear flag 8 (CF8).

NOTE: If stack lift is enabled and a number is keyed in, a stack lift

occurs and the imaginary part is set to 0!

Real number If stack lift is enabled: Enter real part

Imaginary

number

If stack lift is enabled: Enter real part, press Re↔Im

f I Complex number input: <real part> ENTER <imaginary part> f I

f (i) Display imaginary part of number while (i) is held down

Re↔Im

Exchange real and imaginary part

CHS

Changes sign of real part only! Use Re↔Im to negate the imaginary

part as well

CLx or ←

Clears only the real part. However, this disables stack lift for both the

real and imaginary stack so the entry of a complex number after "←"

will do the expected thing

STO & RCL STO & RCL only act on the real part of the number!

Store: STO 1, Re↔Im, STO 2, Re↔Im

Recall: RCL 2, RCL 1, f I

-or-

RCL 2, Re↔Im, ←, RCL 1 (this does not disturb the stack)

x↔y

Replace both real and imaginary part of X and Y register

R↓ R↑

Shift both the real and imaginary part

Sqrt x² Ln Log

1/x e

hyp sin cos tan

hyp

-1

sin cos tan

All these unary functions work in complex mode as well.

NOTE: To calculate sqrt(-1) the complex mode must be already

enabled or otherwise an error occurs!

ABS Calculates magnitude of complex number

+ - x ÷ y

All these binary functions work in complex mode as well

sin cos tan

sin

-1

cos

-1

tan

-1

Trigonometric functions are only executed in radians (2π)

→ P

Convert from rectangular coordinates (real=X, imaginary=Y) to polar

coordinates (real=R, imaginary=θ).

This operation is affected by the current trigonometric setting

(DEG,RAD, GRD)

→ R Convert from polar coordinates (real=R, imaginary=θ) to rectangular

coordinates (real=X, imaginary=Y).

This operation is affected by the current trigonometric setting

(DEG,RAD, GRD)

Conditional tests These tests work for complex numbers and operate on both the real

and imaginary part: x=y, TEST 0 (X≠0), TEST 5 (X=Y), TEST 6 (X≠Y)

All other tests ignore the imaginary part of the complex number

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HP 15C Specifications

General

Memory registers	65
Storage media type	-
Type	Scientific
Cover	No
Form factor	Pocket
Control type	Buttons
Product color	Black, White
Housing material	Plastic
Digits	10 digits
Display type	LCD
Display number of lines	1 lines
Battery type	CR2032
Power source	Battery
Auto power off	Yes
Auto power off after	5 min
Number of batteries supported	2