please use the following command lines
cd (path to the catkin_ws)
source devel/setup.bash
roscore
rosrun signalprocess EMG_publisher.py
rosrun signalprocess EMG_subscriber.py
rosrun signalprocess result_subscriber.py
the EMG_publisher publish a current time and 1x8 signal as requested
the EMG_suscriber subscriber the current and 1x8 signal while create a publisher to publish processed signals including mean and variance
the result_subscriber subsribe to the mean and variance signal to check