[ns] question about scripit

[Chen Wen-Jen <r7725029@im.ntu.edu.tw>]

hello~~~ guys~~~

set by1 [$dest1 set bytes_]
set by2 [$dest2 set bytes_]
set by3 [$dest3 set bytes_]

Could I replace this part of script by

for {set i 0} {$i < 4} {incr i} {
  set by$i [$dest$i set bytes_]
}                               ????
If can't, what should I do?
thanks... :)
               Jay...