robot.launch

<launch>
  <arg name="paused" default="false"/>
  <arg name="use_sim_time" default="true"/>
  <arg name="gui" default="true"/>
  <arg name="headless" default="false"/>
  <arg name="debug" default="false"/>
  <arg name="verbose" default="false"/>
  <arg name="world_name" default="$(find jackal_gazebo)/worlds/hw4.world"/>



  <arg name="gpu" default="false"/>
  <param name="robot_description" command="$(find xacro)/xacro --inorder '$(find jackal_description)/urdf/hw4.urdf.xacro' gpu:=$(arg gpu)" />
  <node pkg="gazebo_ros" type="spawn_model" name="spawn_model" args="-urdf -param /robot_description -model example"/>
  <node pkg="robot_state_publisher" type="robot_state_publisher" name="robot_state_publisher">
    <param name="publish_frequency" type="double" value="30.0" />
  </node>

</launch>