NullDataValue

Purpose

This property defines the value which is designated as NULL for the y data set. Plotting method graphics, tables, and mathematical calculations will ignore NULL data values.

Comments

The default value is zero so Graphs and Scientific Graphs will not graph zero data by default. If you need to graph zeros then change this property to a value that is not expected, like, -99999.

If using single precision YData / XData, you should not use a null data value that has more than 7 digits. For example, -99999999 used as a null data value can not be represented accurately with single precision. Its a good idea to use smaller null data values like -9999 or -1e7. If you need a large null data value, than use double precision YDataII / XDataII.

See Also: NullDataValueX, NullDataValueZ, NullDataGaps, LineGapThreshold