HP HP-28S - Arrays

Non-Keyboard Characters. You can display characters that don't
appear on the HP-28S keyboard by entering a numerical value and
executing CHR. There are also non-displayable characters that you
can print; for a list of all characters, see "STRING" in the Reference
Manual.
Graphics Strings. The command LCD- (LCD to string) returns a
graphics string
that represents the current displayed image; the com-
mand -LCD (string to LCD) displays the image represented by a
graphics-string
argument. For details about these commands, see the
Reference Manual.
String Manipulations. The programs in "Displaying a Binary Inte-
ger",
on page 257, show how to convert an object to string form,
count the number of characters, and join two strings.
Arrays
Arrays can be one-dimensional (called vectors) or two-dimensional
(called matrices), and they can comprise real or complex numbers.
Chapter 11, "Vectors and Matrices," shows the basic calculations with
arrays. Part 1 included the following additional uses for arrays .
•
Chapter 11 shows how to solve a system of n linear equations in n
unknowns by using a an n-element constant vector and an n x n
coefficient matrix. For details about this process and its accuracy,
see "ARRAY" in the Reference Manual.
• In chapter 12, "Statistics," the statistics data you entered was stored
in the current statistics matrix ~DAT.
In Algebraic Syntax. If an array is stored in a variable, you can re-
fer to
elements in the array by using the variable name as a function.
For example, you
could represent the sum of the third and fifth ele-
ments of a vector V as I \} (3) +IJ (5) I.
Array Manipulations. The programs in "Summary Statistics" on
page 262, and "Median of Statistics Data," on page 270, demonstrate a
variety
of array manipulations.
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