Redimensioning Arrays; Arithmetic Arrays - IBM 5100 Basic Reference Manual

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Redimensioning Arrays
Numeric and character arrays can be redimensioned according to the following rules:
• Both one- and two-dimensional arrays can be redimensioned.
• The total number of elements in an array after redimensioning must not exceed
the number originally specified when the array was declared.
• The number of dimensions can be changed.
• The maximum value for a dimension is 255.
• An array can be redimensioned in a MAT assignment statement, a MAT READ
statement, a MAT INPUT statement, or a MAT GET statement.
• The new dimensions for the array can be specified with either a constant
or by an expression.
Arithmetic Arrays
An arithmetic array contains only numeric data and can have one or two dimensions.
Arithmetic arrays are named by a single letter of the extended alphabet (A-Z,
@,
#,
and $). Thus, the letter A can be used to name an arithmetic variable or an arithmetic
array, or both, while the symbol A2 can only be used to name an arithmetic variable.
For example:
A=6
A(l)
=
9
where the variable A
=
6 (scalar) and A(l)
=
9 (arithmetic array element). All ele-
ments of an arithmetic array are initially set to zero when the program is executed
(except those assigned to the common storage area for use in a program that is
chained to; see USE and CHAIN, Chapter 4).
Before being used in any of the matrix-handling statements, an arithmetic array must
have been previously dimensioned, either explicitly or implicitly. Arithmetic arrays
can be redimensioned as described previously.
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