NullDataValueX

Purpose

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

Comments

This property allows independent NULL data values to be set for both XData and YData. NullDataValue is used to define the NULL data value for YData.

The default value is zero so 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:NullDataValue, NullDataValueZ, NullDataGaps.