Texas Instruments TI-92 Owners Manual - Page 256

Overview of List, Data, and Matrix Variables To use the Data/Matrix Editor effectively, you must understand list, data, and matrix variables. List Variable Note: If you enter more than one column of elements in a list variable, it is converted automatically into a data variable. Tip: After creating a list in the Data/Matrix Editor, you can use the list in any application (such as the Home screen). A list is a series of items (numbers, expressions, or character strings) that may or may not be related. Each item is called an element. In the Data/Matrix Editor, a list variable: ¦ Is shown as a single column of elements, each in a separate cell. ¦ Must be continuous; blank or empty cells are not allowed within the list. Column title and header cells are not saved as part of the list. ¦ Can have up to 999 elements. On the Home screen (or anywhere else you can use a list), you can enter a list as a series of elements enclosed in braces { } and separated by commas. Although you must use commas to separate elements on the entry line, spaces separate the elements in the history area. To refer to a specified element in a list, use the format shown to the right. list1[1] Element number (or index number) Name of list variable Data Variable Note: For stat calculations, columns must have the same length. A data variable is essentially a collection of lists that may or may not be related. In the Data/Matrix Editor, a data variable: ¦ Can have up to 99 columns. ¦ Can have up to 999 elements in each column. Depending on the kind of data, all columns may not have to be the same length. ¦ Must have continuous columns; blank or empty cells are not allowed within a column. Chapter 15: Data/Matrix Editor 239