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Built-in Functions / Lists and Matrices / List Operations /

Delete

Usage

• Delete[expr, n] deletes the element at position n in expr. If n is negative, the position is counted from the end.
• Delete[expr, {i, j, ... }] deletes the part at position {i, j, ... }.
• Delete[expr, {{ , , ... }, { , , ... }, ... }] deletes parts at several positions.


Notes

• Example: Delete[ a, b, c, d , 3]LongRightArrow .
• Delete[ a, b, c, d , 1 , 3 ]LongRightArrow .
• Deleting the head of a particular element in an expression is equivalent to applying FlattenAt to the expression at that point.
• Example: Delete[ a, b , c , 2, 0 ]LongRightArrow .
• Deleting the head of a whole expression makes the head be Sequence.
• Example: Delete[ a, b , 0]LongRightArrow .
• Delete works on SparseArray objects.
• See Section 1.8.6 and Section 2.4.2.
• See also: Insert, MapAt, ReplacePart, FlattenAt, DeleteCases, Drop, StringDrop.
• New in Version 2.
Further Examples


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