PermutationBreadth

The least Manhattan distance |i - j| + |p(i) - p(j)| between two points of the permutation matrix.

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PermutationBreadth(p)The least Manhattan distance |i - j| + |p(i) - p(j)| between two points of the permutation matrix.

Typed signatures

Type	Package	Applies
(permutation) -> number	combinatorics	always

Domain: Permutation statistics

Details

• Defined over Permutation as an expression in _x, evaluated by compute-engine — the definition IS the implementation.
• Takes a Permutation and nothing else — it reads values against their positions, or walks the orbits, so it needs the bijection. Applying it to a bare list is a type error, not a wrong answer.

Definition

Epsil, as the implementation runs it.

on Permutation, over _x

0 if Length(_x) < 2 else Min(Map(
                                  Function(
                                            Min(Map(
                                                     Function(
                                                               Abs(i - j) +
                                                               Abs(_x[i] - _x[j]),
                                                               j,
                                                             ),
                                                     Range(i + 1, Length(_x)),
                                                   )),
                                            i,
                                          ),
                                  Range(1, Length(_x) - 1),
                                ))

Examples

Basic #

the one-line word $312$

live ↗

In$\mathrm{PermutationBreadth}({\operatorname{Permutation}}([3, 1, 2]))$Out$2$

the one-line word $2413$

live ↗

In$\mathrm{PermutationBreadth}({\operatorname{Permutation}}([2, 4, 1, 3]))$Out$3$

Properties #

FindStat's value for [1,2]

live ↗

In$\mathrm{CombinatorialStat}({\operatorname{Permutation}}([1, 2]), \text{PermutationBreadth})$Out$2$

Known value · FindStat St000842

FindStat's value for [2,1]

live ↗

In$\mathrm{CombinatorialStat}({\operatorname{Permutation}}([2, 1]), \text{PermutationBreadth})$Out$2$

Known value · FindStat St000842

FindStat's value for [1,2,3]

live ↗

In$\mathrm{CombinatorialStat}({\operatorname{Permutation}}([1, 2, 3]), \text{PermutationBreadth})$Out$2$

Known value · FindStat St000842

About

Examples	5
Crosswalk	FindStat