Commodore 128D - Page 264

DELETE
DIM
EXAMPLE:
10 DEF FNA(X) = 12*(34.75-X/.3) + X
20 PRINT FNA(7)
The number 7 is inserted each place X is located in the formula given
in the DEF statement. In the example above, the answer returned is
144. (Function definitions are lost if BASIC is moved—e.g., from
$1C00 to $4000 when a GRAPHIC call occurs. Invoke a graphic
mode before defining functions.)
—Delete lines of a BASIC program in the specified range
DELETE [first line] [-last line]
This command can be executed only in direct mode.
EXAMPLES:
Deletes line 75.
Deletes lines 10 through 50, inclusive.
DELETE 75
DELETE 10-50
DELETE-50
DELETE 75-
Deletes all lines from the beginning of the
program up to and including line 50.
Deletes all lines from 75 to the end of the
program, inclusive.
—Declare number of elements in an array
DIM variable (subscripts) [,variable(subscripts)]...
Before arrays of variables can be used, the program must first exe
cute a DIM statement to establish DIMensions of the array (unless
there are 11 or fewer elements in the array). The DIM statement is
followed by the name of the array, which may be any legal variable
name. Then, enclosed in parentheses, put the number (or numeric
variable) of elements in each dimension. An array with more than
one dimension is called a matrix. Any number of dimensions may be
used, but keep in mind the whole list of variables being created takes
up space in memory, and it is easy to run out of memory if too many
are used. Here's how to calculate the amount of memory used by an
array:
5 bytes for the array name
2 bytes for each dimension
2 bytes/elements for integer variables
5 bytes/elements for normal numeric variables
3 bytes/elements for string variables
1 byte for each character in each string element
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LJ
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BASIC 7.0 ENCYCLOPEDIA—Basic Commands and Statements