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Macaulay2Doc :: pack

pack -- pack elements of a list into several shorter lists

Synopsis

Description

The commands pack(A, n) and pack(n, A) produce identical results.

i1 : pack(a..l, 3)

o1 = {{a, b, c}, {d, e, f}, {g, h, i}, {j, k, l}}

o1 : List
i2 : pack(3, a..l)

o2 = {{a, b, c}, {d, e, f}, {g, h, i}, {j, k, l}}

o2 : List

If n doesn’t divide the length of A, the last list will have fewer than n elements.

i3 : pack(a..m, 3)

o3 = {{a, b, c}, {d, e, f}, {g, h, i}, {j, k, l}, {m}}

o3 : List

pack and mingle can be used together to take a transpose of lists

i4 : pack(2, mingle(a..m, 0..12))

o4 = {{a, 0}, {b, 1}, {c, 2}, {d, 3}, {e, 4}, {f, 5}, {g, 6}, {h, 7}, {i, 8},
     ------------------------------------------------------------------------
     {j, 9}, {k, 10}, {l, 11}, {m, 12}}

o4 : List

See also

Ways to use pack :