HP -28S Manual page 29

1. Object types and formats. This table shows the correct delimit-
ers and examples for the 10 basic types of object. An "object" is any of
the individual items you work with on the calculator. The 10 basic
object types are:
• Real numbers, such as 5 or -4.3
X
10
15 .
• Complex numbers, which are a pair of real numbers representing a
complex number x
+
iy
or a point in a plane.
• Binary integers, which are unsigned integers used in computer
science.
• Strings, which contain arbitrary sequences of characters.
• Vectors, which are one-dimensional arrays used in linear algebra.
• Matrices, which are two-dimensional arrays used in linear algebra.
• Lists, which contain arbitrary sequences of objects.
• Names, which enable you to name and store other objects and to
perform symbolic calculations.
• Programs, which enable you to create your own commands.
• Algebraics, which represent mathematical expressions and
equations.
2. Menu selection (shifted). Use the menu selection keys to assign
commands to the menu keys. For example, press
.1
ARRAY
I
to select
the ARRAY menu. To select a different menu, press another menu
selection key.
There are additional menu selection keys on the right-hand keyboard
(see item 16).
3. Object delimiters. These symbols identify the different object
types (see item 1). For example,
0
identifies binary integers, while
0
and
.0
identify programs.
Real numbers require no delimiters. Symbolic objects (names and
algebraics) require the
CJ
delimiter, located on the right-hand key-
board (see item 11).
4. Lowercase. Press
o:;QJ
to key in lowercase letters. Lowercase
mode continues until you press
o:;QJ
a second time, press
1
ENTER
I
to
process the command line, or press
ION
I
to clear the command line.
28 1: Getting Started
I