It is printed by sprintf(log_target_->pt_->buffer(),"N -t %f -n %d -e %f", s.clock(), address_, energy_model_->energy()); in function MobileNode::log_energy() So maybe only the author knows the meaning of N, eNergy? Node? I think you can just regard it as a tag to identify energy decrease.
Pei Huang, Ph.D. student Dept. of Computer Science and Engineering Michigan State University http://dekst.awardspace.com --------------------------------- 雅虎邮箱,您的终生邮箱!