DeleteCases

Usage

• 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.
• DeleteCases[expr, pattern, levspec, n] removes the first n parts of expr which match pattern.

Notes

• 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,

, Heads -> True]

• Level specifications are described in Section A.3.6.

• See Section 2.3.2.

• See also: Cases, ReplaceAll, Delete.

• New in Version 2; modified in 4.1.

Further Examples