Texas Instruments TI-89 Titanium User Manual page 514

• In a list variable, a cell in the gap is undefined until you enter a value for the cell.
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If you enter more than one column of elements in a list variable, it is converted
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automatically into a data variable.
• In a data variable, gaps in a column are handled the same as a list. However, if you
leave a gap between columns, that column is blank.
• In a matrix variable, when you enter a value in a cell outside the current boundaries,
additional rows and/or columns are added automatically to the matrix to include the
new cell. Other cells in the new rows and/or columns are filled with zeros.
Although you specify the size of a matrix when you create it, you can easily
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add additional rows and/or columns.
Data/Matrix Editor
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