
Common Question 14My graph has zero values in it but they are not being graphed. What is wrong?ProEssentials include a NullData mechanism which consists of properties that define the NullData value for both YData and XData (the default value is zero). Anytime ProEssentials sees a datapoint value equal to the NullData value, that datapoint is ignored. The NullData value will not be graphed, tabled, or used in bestfit or statistical calculations.
NullDataValue defines the NullData value for YData. NullDataValueX defines the NullData value for XData.
The Graph object only uses NullDataValue since it does not contain XData.
If your data has zero values that need to be graphed, you should set the NullData values to some other unexpected value, for example 9999. For the Scientific Graph, make sure to set both NullDataValue and NullDataValueX in order to graph zero values. Also, it is recommended to use a number like negative [9999 or some other nonexpected value] when using single precision storage because larger or more elaborate numbers sometimes have rounding problems.
Also take a look at Question 16. It may answer a common problem seen when changing the null data value.

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