https://nl.mathworks.com/help/matlab/ref/matlab.system.mixin.finitesource-class.html
matlab.system.mixin.FiniteSource - Class that adds ability to check for the end of finite data...
Use the matlab.system.mixin.FiniteSource class when you create a System object that reads data from a finite source, such as a file.
https://la.mathworks.com/help/matlab/ref/matlab.system.mixin.finitesource.isdoneimpl.html
matlab.system.mixin.FiniteSource.isDoneImpl - End-of-data flag - MATLAB
This MATLAB function specifies whether the end of the data has been reached.
end ofmatlabsystemmixindata