If a cell of the table dialog box table is blank, it means that the value of the cell has not been specified. You may be building up a net over a number of sessions with Netica, and you can use the empty cells to keep track of which parts of the table have not yet been entered.
New tables start out with all empty cells, and you can set any cell or group of cells to empty by selecting the cells and then pressing the delete key or choosing Edit → Delete. If the node is deterministic, you can set a cell to empty by choosing “Unknown” from the pop-up menu which appears when you click on the cell.
If you do inference (e.g. belief updating)
with a net that has node tables with empty cells, Netica will consider
them to be uniform, and give you a warning message.
Netica can find and display all the nodes whose tables have one
or more empty cells. more
info