Complex-Number Functions; Using Complex Numbers - HP -28S Manual

Complex-Number
Functions
6
The HP-28S includes an object type that represents complex numbers.
For example, the complex number z
=
3
+
4i is represented by the
object
(3.,
4 ). Because each complex number is a single object, you
can calculate with complex numbers as easily as real numbers.
The pair of real numbers in a complex number can represent the co-
ordinates of a point in a plane. For example, the HP-28S uses
complex numbers to represent plotting coordinates. The second sec-
tion in this chapter describes two coordinate systems, rectangular and
polar, and shows how to convert a point from one system to the
other.
Using Complex Numbers
Most functions that work with real numbers work the same way with
complex numbers. For example, you do arithmetic with complex num-
bers just as you do real numbers-put the numbers on the stack and
execute the function. Try calculating the following:
((9
+
2i)
+
(-4
+
3i»
x
(6
+
i)
Clear the stack and enter 9
+
2i .
• 1
CLEAR
1
OJ
9 [ ] 2
~I
E-N-T-ER-I
82 6: Complex-Number Functions