创建launch文件的代码turtlemimic.launch

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 <launch>

     <group ns="turtlesim1">    
 <node pkg="turtlesim" name="sim" type="turtlesim_node"/>
     </group>     
 <group ns="turtlesim2">    
 <node pkg="turtlesim" name="sim" type="turtlesim_node"/>     
 </group>     
 <node pkg="turtlesim" name="mimic" type="mimic">     
 <remap from="input" to="turtlesim1/turtle1"/>     
 <remap from="output" to="turtlesim2/turtle1"/>
 </node>     

 </launch>

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原版在wiki百科的是

   1 <launch>
   2 
   3   <group ns="turtlesim1">
   4     <node pkg="turtlesim" name="sim" type="turtlesim_node"/>
   5   </group>
   6 
   7   <group ns="turtlesim2">
   8     <node pkg="turtlesim" name="sim" type="turtlesim_node"/>
   9   </group>
  10         
  11   <node pkg="turtlesim" name="mimic" type="mimic">
  12     <remap from="input" to="turtlesim1/turtle1"/>
  13     <remap from="output" to="turtlesim2/turtle1"/>
  14   </node>
  15 
  16 </launch>