[igraph] silly error im getting in igraph

[P S Das]

Dear All

Suddenly im finding a silly error in igraph

and i am not able to understand why its showing so

g <- graph( c(0,1, 1,2, 3,4, 5,6) )

Error in graph(c(0, 1, 1, 2, 3, 4, 5, 6)) : 

  At structure_generators.c:84 : Invalid (negative) vertex id, Invalid vertex id

but if i put

 g <- graph( c(1,2, 3,4, 5,6) )

> g

IGRAPH D--- 6 3 --

doesnot give any error

so far i know the vertices in igraph starts from 0. 

I am using R version 2.15.3 and i graph version  0.6.5-2 

Regards,
Partha Sarathi Das

RA,
Bioinformatics Infrastructure Facility,
Vidyasagar University,
Midnapore, India

Mobile : +91 98 31 32 32 32