https://www.mathworks.com/help/releases/R2018b/matlab/ref/varargout.html

varargout

• Variable-length output argument list

  Syntax

• varargout

  Description

• varargout is an output variable in a function definition statement that enables the function to return any number of output arguments. Specify varargout using lowercase characters, and include it as the last output argument after any explicitly declared outputs.

• When the function executes, varargout is a 1-by-N cell array, where N is the number of outputs requested after the explicitly declared outputs.