[igraph] Error while using edgelist function

[anupam sinha]

Dear all,

             While using the graph.edgelist funtion I give a file as the input. This file contains the edgelist representation of the metabolic network of yeast. The following is the kind of input I am giving and the error I am getting :

Source_node Destination_node
Q0045    Q0045
Q0045    Q0250
Q0045    Q0275
Q0045    YDL067C
Q0045    YGL187C
Q0045    YGL191W
Q0045    YHR051W
Q0045    YIL111W
Q0045    YLR038C


 g<-graph.edgelist("/home/anupam/Desktop/network_analysis/gerstein_C-programs_network/met_network_yeast.txt", directed =FALSE)
Error in graph.edgelist("/home/anupam/Desktop/network_analysis/gerstein_C-programs_network/met_network_yeast.txt",  : 
  graph.edgelist expects a matrix with two columns


Can anyone help me with this??? Thanks in advance.


Regards,

Anupam Sinha