[igraph] Error in using the function subcomponent( )

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Hello!

 

I am trying to use the subcomponent() to find the in-component and out-component from a given vertice.

Here is the source code and result:

 

> g<-read.graph("input.txt", "edgelist")

> subcomponent(g, 4, "in")

[1] 4

> subcomponent(g, 4, "out")

[1] 4 3

> subcomponent(g, 4, "all")

[1]  4  3 10  5  7  6  8  2  9

 

Here is the input file "input.txt" (a directed network with 10 nodes and 10 edges):

1   5

1   7

3   2

4   5

4   7

4   9

9   4

6   9

8   7

9   2

 

But the actual result is should be:

subcomponent(g, 4, "in"):  4 6 9

subcomponent(g, 4, "out"):  2 4 5 7 9

subcomponent(g, 4, "all"):  2 4 5 6 7 9

 

Why is the results computed by using the function subcomponent( ) different from the actual result?

 

best

Xueming

 

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