switch -- copy a list, switching two elements

• Usage:

  switch(i, j, L)

• Inputs:
  • i, an integer,
  • j, an integer,
  • L, a basic list,
• Outputs:
  • L2, a basic list, a copy of the list L, with the elements in positions i and j interchanged.

i1 : L = 0..10;

i2 : switch(3, 9, L)

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

o2 : Sequence

i3 : switch(0, -1, L)

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

o3 : Sequence

i4 : switch(-1, -2, L)

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

o4 : Sequence