Delete

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,{{i1,j1,},{i2,j2,},}]

deletes parts at several positions.

Delete[pos]

represents an operator form of Delete that can be applied to an expression.

Details

  • Deleting the head of a particular element in an expression is equivalent to applying FlattenAt to the expression at that point. »
  • Deleting the head of a whole expression makes the head be Sequence. »
  • Deleting a whole expression gives the result Sequence[].
  • Delete works on SparseArray objects.
  • Delete works on associations, deleting elements with the specified keys.
  • Delete[pos][expr] is equivalent to Delete[expr,pos].

Examples

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Basic Examples  (5)

Delete the element at position 3:

Delete at position 2 from the end:

Delete at positions 1 and 3:

Delete in a 2D array:

Delete from an Association:

Generalizations & Extensions  (3)

Delete in an expression with any head:

Delete at any position in any expression:

Delete a head to splice in its arguments:

Properties & Relations  (2)

Deleting the head of a whole expression gives a Sequence object:

Deleting at an empty list of positions does not change the expression:

Deleting at position {} eliminates the whole expression:

Introduced in 1991
 (2.0)
 |
Updated in 2003
 (5.0)
2014
 (10.0)