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DeleteCases
DeleteCases[
expr
,
pattern
] removes all elements of expr which match pattern.
DeleteCases[
expr
,
pattern
,
levspec
] removes all parts of expr on levels specified by levspec which match pattern.
Example: DeleteCases[
1, a, 2, b
, _Integer] .
With the option Heads
->
True, you can delete heads with DeleteCases. Deleting the head of a particular element in an expression is equivalent to applying FlattenAt to the expression at that point.
Example: DeleteCases[
1, f[2, 3], 4
, f,
2
, Heads -> True].
Level specifications are described in Section A.3.6.
See the Mathematica book: Section 2.3.2.
See also: Cases, ReplaceAll, Delete.
Further Examples
This deletes all elements of the list that are real numbers.
In[1]:= 
Out[1]= 
This command deletes all integers from levels 1 to 2.
In[2]:= 
Out[2]= 
In contrast this command deletes all integers only at level 2.
In[3]:= 
Out[3]= 
THIS IS DOCUMENTATION FOR AN OBSOLETE PRODUCT. SEE THE DOCUMENTATION CENTER FOR THE LATEST INFORMATION. | | | |
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