Hello all: 
   i am using "nd" to move my robots to goto somewhere in stage. But
strangely the command --SetSpeed(1.0,0.0) doesn't have any effect in
controlling the speed of robot, but the max_speed [ ] declared in the .cfg
file for "nd" driver just controls the actual speed. Why? because i have to
change the speed in the process of moving, so could anyone explane what't
the matter? 
  part of the .cfg file: 
driver 
( 
  name "nd" 
  provides ["6666:position2d:1"] 
requires ["output::6666:position2d:0" "input::6666:position2d:0"
"6666:laser:0" "6666:sonar:0"] 
#goal_tol [0.3 15.0] 
min_speed [0.0 30] 
max_speed [5.0 30] 
wait_on_stall 1 
) 
so the robot in stage can only moves at the speed of 5.0. 
  Thanks!
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