Texas Instruments TI-83 PLUS - Manual (Page 304)

TI-83 Plus Lists 301
Using dim( to Find List Dimensions
dim( (dimension) returns the length (number of elements) of list .
dim( list )
Using dim( to Create a List
You can use dim( with ¿ to create a new listname with dimension
length from 1 to 999. The elements are zeros.
length! dim( listname )
Using dim( to Redimension a List
You can use dim with ¿ to redimension an existing listname to
dimension length from 1 to 999.
•
The elements in the old listname that are within the new dimension are
not changed.
•
Extra list elements are filled by 0 .
•
Elements in the old list that are outside the new dimension are deleted.