Shanika's profile - activity

Hello,
I am trying to write a python code using the Float32MultiArray to run my robot's motors.

The code is below:

motor = rospy.Publisher('encoder', Float32MultiArray, queue_size = 2)

while not rospy is shutdown():

    arg = Float32MultiArray()
    arg.layout.dim[0].label ="x"
    arg.layout.dim[0].size = 1
    arg.layout.dim[0].stride = 1

    arg.layout.dim[1].label ="y"
    arg.layout.dim[1].size = 1
    arg.layout.dim[1].stride = 1

    arg.layout.data_offset = 1
    arg.data = [100, 100]

    motor.publish(arg)

However, I have the error below:

TypeError: Invalid number of arguments, arg should be ['layout','data'] args are(0.0)

Could you please help me ?

Thank you in advance,

Shanika

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Hello,

I am trying to run the frontier_exploration on ROS Melodic for my turtlebot3 burger but I am facing an error and a few warnings :

[ INFO] [1592915203.801508707]: global_costmap: Using plugin "obstacle_layer"
[ INFO] [1592915203.805797584]: explore_costmap: Using plugin "explore_boundary"
terminate called after throwing an instance of 'pluginlib::LibraryLoadException'
  what():  According to the loaded plugin descriptions the class frontier_exploration::BoundedExploreLayer with base class type costmap_2d::Layer does not exist. Declared types are  costmap_2d::InflationLayer costmap_2d::ObstacleLayer costmap_2d::StaticLayer costmap_2d::VoxelLayer polygon_layer::PolygonLayer

[ INFO] [1592915203.807513999]:     Subscribed to Topics: scan
[ INFO] [1592915203.826659128]: global_costmap: Using plugin "inflation_layer"
[ WARN] [1592915203.864713435]: local_costmap: Pre-Hydro parameter "static_map" unused since "plugins" is provided
[ WARN] [1592915203.865053590]: local_costmap: Pre-Hydro parameter "map_type" unused since "plugins" is provided
[ INFO] [1592915203.865672566]: local_costmap: Using plugin "obstacle_layer"
[ INFO] [1592915203.873300348]:     Subscribed to Topics: scan
[ INFO] [1592915203.884410664]: local_costmap: Using plugin "inflation_layer"
[ INFO] [1592915203.910916229]: Created local_planner dwa_local_planner/DWAPlannerROS
[ INFO] [1592915203.913519360]: Sim period is set to 0.10

[exploration_server_node-5] process has died [pid 557, exit code -6, cmd /home/madhushi/catkin_ws/devel_isolated/exploration_server/lib/exploration_server/exploration_server_node __name:=exploration_server_node __log:=/home/x/.ros/log/42335398-b534-11ea-ad57-6c2b5954a7e6/exploration_server_node-5.log].
log file: /home/x/.ros/log/42335398-b534-11ea-ad57-6c2b5954a7e6/exploration_server_node-5*.log

In frontier_exploration.yaml:

plugins:
  - {name: static,           type: "costmap_2d::StaticLayer"}
  - {name: explore_boundary, type: "frontier_exploration::BoundedExploreLayer"}
  - {name: sensor,           type: "costmap_2d::ObstacleLayer"}
  - {name: inflation,        type: "costmap_2d::InflationLayer"}

[exploration_server_node-5] process has died Hello, I am trying to run the frontier_exploration on ROS Melodic for my t

The issue was the plugin name that changed from frontier_exploration::BoundedExploreLayer to polygon_layer::PolygonLayer

Hi, I have the same warning, about the class_loader. What does tc_ in the code corresponds to ?

failed to call update polygone service Hello, I am trying to run the frontier_exploration on ROS Melodic for turtlebot3

[exploration_server_node-5] process has died Hello, I am trying to run the frontier_exploration on ROS Melodic for my t

[exploration_server_node-5] process has died Hello, I am trying to run the frontier_exploration on ROS Melodic for my t

Hi, how did you fix this ?

Hello, I have the same problem. Did you solve this ?

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