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Python sample codes for robotics algorithms.

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When I run `ArmNavigation/rrt_star_seven_joint_arm_control/rrt_star_seven_joint_arm_control.py`, I get an error: ```Traceback (most recent call last): File "/Users/tim/PythonRobotics/ArmNavigation/rrt_star_seven_joint_arm_control/rrt_star_seven_joint_arm_control.py", line 405, in main() File "/Users/tim/PythonRobotics/ArmNavigation/rrt_star_seven_joint_arm_control/rrt_star_seven_joint_arm_control.py", line 384, in main ax = rrt_star.draw_graph() ^^^^^^^^^^^^^^^^^^^^^ File...

When I run `ArmNavigation/rrt_star_seven_joint_arm_control/rrt_star_seven_joint_arm_control.py`, I get an error: ```Traceback (most recent call last): File "/Users/tim/PythonRobotics/ArmNavigation/rrt_star_seven_joint_arm_control/rrt_star_seven_joint_arm_control.py", line 405, in main() File "/Users/tim/PythonRobotics/ArmNavigation/rrt_star_seven_joint_arm_control/rrt_star_seven_joint_arm_control.py", line 384, in main ax = rrt_star.draw_graph() ^^^^^^^^^^^^^^^^^^^^^ File...

#### What does this implement/fix? In def calc_heuristic_map(M, goal_node), the current code appears to calculate the cost from every node through 4 corners to the goal node and tries to...