HP 15c Collector's Edition User Manual

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Section 11
Calculating With
Complex Numbers
The HP 15c enables you to calculate with complex numbers, that is,
numbers of the form
a + ib,
where a is the real part of the complex number,
b is the imaginary part of the complex number, and
i = √ −1.
As you will see, the beauty of calculating with the HP 15c in Complex mode
is that once the complex numbers are keyed in, most operations are
executed in the same manner as with real numbers.
The Complex Stack and Complex Mode
Calculations with complex numbers are
performed using a complex stack
composed of two parallel four-register
stacks (and two LAST X registers). One of
these parallel stacks—referred to as the
real stack—contains the real parts of
complex numbers used in calculations.
(This is the same stack used in ordinary
calculations.) The other stack—referred
to as the imaginary stack—contains the
imaginary parts of complex numbers
used in calculations.
Creating the Complex Stack
The imaginary stack is created (by converting five storage registers as
described in Appendix C) when you activate Complex mode; it does not
exist when the calculator is not in Complex mode.
Real
Stack
Imaginary
Stack
T
Z
Y
X
LAST X

HP 15c Collector's Edition Specifications

General

Brand	HP
Model	15c Collector's Edition
Category	Calculator
Language	English