Hi,
This is likely a limitation with your current version of MATLAB. When you create a ROS 2 message in MATLAB (e.g., std_msgs/Float64MultiArray), the message fields such as data are preallocated with a specific type and size. If you attempt to assign a whole new array (e.g., rmsg.data = zeros(1, 20)) or use coder.nullcopy, MATLAB Coder detects a type or size mismatch and produces an error.
Workaround:
Instead of coder.nullcopy(zeros(1, 20)), please use a loop to initialize msg.data as shown below:
function LidarObstacle()
%#codegen
pointnode_lane = ros2node("/ouster_driver_lane");
pubdistance_lane = ros2publisher(pointnode_lane,"/LaneDist","std_msgs/Float64MultiArray");
msg = ros2message(pubdistance_lane);
for ii = 1:20
msg.data(ii) = 0;
end
