isSink -- determines if a vertex of a digraph is a sink or not

Synopsis

• Usage:

  r = isSink (D, v)

• Inputs:
  • D, an instance of the type Digraph,
  • v, a thing, the vertex being texted
• Outputs:
  • r, a Boolean value, whether the vertex v is a sink or not

Description

i1 : D = digraph({a,b,c,d,e},{{a,b},{b,c},{b,d},{e,b}});

i2 : isSink (D,b)

o2 = false

i3 : isSink (D,d)

o3 = true

See also

• sinks -- returns the sinks of a digraph