Wolfram Mathematica Documentation Center
DOCUMENTATION CENTER SEARCH
Mathematica >
Built-in Mathematica Symbol|See Also »

Missing

Missing[]
represents data that is missing.
Missing["reason"]
specifies a reason for the data being missing.
Missing["reason", expr]
associates the expression expr with the missing data.
  • Missing[...] is a symbolic object, with no default evaluation rules defined.
  • Typical examples of "reason" include "NotApplicable", "Unknown", "NotAvailable", "Nonexistent", "Indeterminate", "Variable", "Disputed" or "TooLarge".
  • Plotting functions automatically omit Missing objects when plotting data.
EXAMPLESCLOSE ALL
Basic Examples   (3)
When properties a missing a Missing object is returned:
In[1]:=
Click for copyable input
Out[1]=
In[2]:=
Click for copyable input
Out[2]=
 
Missing elements can be filtered out using DeleteCases:
In[1]:=
Click for copyable input
Out[1]=
 
Visualization typically automatically filter out Missing elements:
In[1]:=
Click for copyable input
Out[1]=
New in 6
Ask a question about this page  |  Suggest an improvement  |  Leave a message for the team