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Delete

WMA link

Delete[expr, i]

deletes the element at position i in expr. The position is counted from the end if i is negative.

Delete[expr, {m, n, ...}]

deletes the element at position {m, n, ...}.

Delete[expr, {{$m_1$, $n_1$, ...}, {$m_2$, $n_2$, ...}, ...}]

deletes the elements at several positions.

Delete the element at position 3:

• • Delete[{a, b, c, d}, 3]

Delete at position 2 from the end:

• • Delete[{a, b, c, d}, -2]

Delete at positions 1 and 3:

• • Delete[{a, b, c, d}, {{1}, {3}}]

Delete in a 2D array:

• • Delete[{{a, b}, {c, d}}, {2, 1}]

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

• • Delete[{a, b, c}, 0]

Delete in an expression with any head:

• • Delete[f[a, b, c, d], 3]

Delete a head to splice in its arguments:

• • Delete[f[a, b, u + v, c], {3, 0}]

• • Delete[{a, b, c}, 0]

Delete without the position:

• • Delete[{a, b, c, d}]

Delete with many arguments:

• • Delete[{a, b, c, d}, 1, 2]

Delete the element out of range:

• • Delete[{a, b, c, d}, 5]

Delete the position not integer:

• • Delete[{a, b, c, d}, {1, n}]