swirl -- swirl matroid

Synopsis

• Usage:

  M = swirl r

• Inputs:
  • r, an integer,
• Outputs:
  • a matroid, a free swirl

Description

i1 : areIsomorphic(swirl 3, uniformMatroid_3 6)

o1 = true

i2 : M = swirl 4

o2 = a "matroid" of rank 4 on 8 elements

o2 : Matroid

i3 : betti ideal M

            0  1
o3 = total: 1 44
         0: 1  .
         1: .  .
         2: .  .
         3: .  4
         4: . 40

o3 : BettiTally

i4 : M == dual M

o4 = true

i5 : getSeparation(M, 3)

o5 = set {0, 1, 6, 7}

o5 : Set

See also

• specificMatroid -- creates built-in matroid