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MissingBehavior—Wolfram Language Documentation

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• See Also
  • Missing
  • PartBehavior
  • FailureAction
  • Query
• Related Guides
  • Computation with Structured Datasets

MissingBehavior

is an option to Query and related functions that specifies how expressions with head Missing should be interpreted in the context of other functions.

• The following settings can be given:
• Special behavior invoked by the setting MissingBehavior->Automatic includes:
• Mean,Median,StandardDeviation,… empty lists yield Missing["Indeterminate"] Total,Mean,Median,Min,Max,… Missing elements are dropped or ignored Times,Minus,Power,… Missing elements yield Missing["Indeterminate"] Counts,GroupBy,Map,… application to a single Missing yields another Missing

The default behavior of Query operations is to apply special rules:

Use the ordinary behavior of Missing:

Statistics functions on list of objects ignore Missing objects by default in Query operations:

They act in the same way on Dataset operations:

Using MissingBehaviorNone makes Missing objects be preserved:

This would be equivalent to direct action of Mean on the list or Dataset object:

Statistics functions on lists of insufficient length return Missing["Indeterminate"]:

Some operations with variable number of arguments ignore Missing objects by default in Query:

They act in the same way on Dataset operations:

Using MissingBehaviorNone makes Missing objects be preserved:

Other operations return Missing["Indeterminate"] by default:

Using MissingBehaviorNone makes Missing objects be preserved:

Structural and extraction operations in Query always preserve Missing objects:

The value of the MissingBehavior option does not affect the result:

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