hello,everyone,i want to add a monitor queue to ns,but it works not well,what's 
wrong with it?
the tcl is:

set qf [open qwf.tr w]
set qt [$ns trace-queue $n0 $n2  $qf]
set qm [$ns monitor-queue $n0 $n2  $qt]
#the up three works well,but the next is wrong:
puts [$qm pdrops_]//here i want to account the drop packets


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