Commodore Plus 4 - Page 192

180 Some Programming Techniques
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>2108 02 03 95 04 03 56 02 03
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>2118 03 Al 02 03 A6 02 03 AB
>2120 02 03 95 02 03 Al 04 03
>2128 AB 02 03 95 02 03 Al 04
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Using Arrays to Handle Groups of Data
An array, which is also called a matrix, is a set of related values. A two-
dimensional array is organized into numbered "rows" and "columns." The name
of the array and the number of elements the array can contain are established in
an array-DIMensioning command. After an array is defined in a DIM command,
you can use values in the array as individual data items. You refer to any element
of a two-dimensional array by giving the array variable name and the row and
column number in the array where the element is located. This row-and-column
address is called a subscript of the array.
An array can have one, two, or more dimensions. A one-dimensional array has
only a row of data. A two-dimensional array has rows and columns of data.
Arrays with more than two dimensions have more complex data configurations.
You need not be able to visualize multidimensional arrays to work with them
effectively.
You should always DIMension an array before you use it. If you use an array
element without first DIMensioning the array, the computer gives the array the
default number of elements (11). You cannot change the dimensions of an array
after you have DIMensioned it or after you have accepted the default dimensions.
A0^ If you DIM the array after you have used it, or try to reDIM the array, the
v \y^ program aborts and the error message REDIM'D ARRAY is displayed.
The array name is a variable that follows standard variable rules. Arrays
containing text elements must have text-string variable names. Arrays containing
numeric elements must have a numeric variable name.
The subscripts set the number of rows and columns in a two-dimensional
array. Rows are listed first. If you are using a one-dimensional array, there is no
column number.