next | previous | forward | backward | up | top | index | toc | Macaulay2 website
Matroids :: deletion

deletion -- deletion of subset of matroid

Synopsis

Description

The deletion M \ S is obtained by restricting to the complement of S.

i1 : M = matroid({a,b,c,d},{{a,b},{a,c}})

o1 = a matroid of rank 2 on 4 elements

o1 : Matroid
i2 : N = M \ {a}

o2 = a matroid of rank 1 on 3 elements

o2 : Matroid
i3 : peek N

o3 = Matroid{bases => {set {0}, set {1}} }
             cache => CacheTable{...2...}
             groundSet => set {0, 1, 2}
             rank => 1
i4 : N == M \ set{0}

o4 = true

See also

Ways to use deletion :

For the programmer

The object deletion is a method function.