insert -- copy a list, inserting an element

Synopsis

• Usage:

  insert(i, x, L)

• Inputs:
  • i, an integer,
  • x, a thing,
  • L, a visible list,
• Outputs:
  • L2, a visible list, a copy of L in which x has been inserted into position i

Description

i1 : L = 0..10

o1 = (0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10)

o1 : Sequence

i2 : insert(4, "hi", L)

o2 = (0, 1, 2, 3, hi, 4, 5, 6, 7, 8, 9, 10)

o2 : Sequence

i3 : insert(0, "hi", L)

o3 = (hi, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10)

o3 : Sequence

i4 : insert(11, "hi", L)

o4 = (0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, hi)

o4 : Sequence

i5 : insert(-1, "hi", L)

o5 = (0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, hi)

o5 : Sequence

i6 : apply({-1,-3,-5}, i -> L = insert(i, "hi", L)); L

o7 = (0, 1, 2, 3, 4, 5, 6, 7, 8, hi, 9, hi, 10, hi)

o7 : Sequence

See also

• delete -- delete some elements of a list
• mingle -- mingle elements of several lists
• switch -- copy a list, switching two elements
• lists and sequences -- a detailed overview of lists and sequences in Macaulay2