iterators.md
In igraph: Network Analysis and Visualization

printing connected vs/es works

Code
  vs
Output
  + 10/10 vertices:
   [1]  1  2  3  4  5  6  7  8  9 10
Code
  es
Output
  + 10/10 edges:
   [1] 1-- 2 2-- 3 3-- 4 4-- 5 5-- 6 6-- 7 7-- 8 8-- 9 9--10 1--10
Code
  vs[1:5]
Output
  + 5/10 vertices:
  [1] 1 2 3 4 5
Code
  es[1:5]
Output
  + 5/10 edges:
  [1] 1--2 2--3 3--4 4--5 5--6
Code
  vs[numeric()]
Output
  + 0/10 vertices:

Code
  es[numeric()]
Output
  + 0/10 edges:

printing named connected vs/es works

Code
  vs
Output
  + 10/10 vertices, named:
   [1] a b c d e f g h i j
Code
  es
Output
  + 10/10 edges (vertex names):
   [1] a--b b--c c--d d--e e--f f--g g--h h--i i--j a--j
Code
  vs[1:5]
Output
  + 5/10 vertices, named:
  [1] a b c d e
Code
  es[1:5]
Output
  + 5/10 edges (vertex names):
  [1] a--b b--c c--d d--e e--f
Code
  vs[numeric()]
Output
  + 0/10 vertices, named:

Code
  es[numeric()]
Output
  + 0/10 edges (vertex names):

printing unconnected vs/es works

Code
  vs
Output
  + 10/? vertices (deleted):
   [1]  1  2  3  4  5  6  7  8  9 10
Code
  es
Output
  + 10/? edges (deleted):
   [1]  1  2  3  4  5  6  7  8  9 10

Code
  vs
Output
  + 10/? vertices (deleted):
   [1]  1  2  3  4  5  6  7  8  9 10
Code
  es
Output
  + 10/? edges (deleted) (vertex names):
   [1] a|b b|c c|d d|e e|f f|g g|h h|i i|j a|j

logical indices are not recycled

Code
  V(g)[c(TRUE, FALSE)]
Condition
  Error in `FUN()`:
  ! Error: Logical index length does not match the number of vertices. Recycling is not allowed.

Code
  E(g)[c(TRUE, FALSE)]
Condition
  Error in `FUN()`:
  ! Error: Logical index length does not match the number of edges. Recycling is not allowed.