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RVIZ is just visual tool for displaying ROS messages, therefore getting data from RVIZ means getting data from ROS topic. MATLAB has support for ROS (look here). You should be able to create subscriber (look here) in MATLAB to the given topic and do whatever you want with the data.

RVIZ RVIZ is just visual tool for displaying ROS ROS messages, therefore getting data from RVIZ RVIZ means getting data from ROS ROS topic. MATLAB MATLAB has support for ROS ROS (look here). You should be able to create subscriber (look here) in MATLAB MATLAB to the given topic and do whatever you want with the data.