MATLAB: How to write a function with two kind of output modes

functionoutput

How to write a function which can be used as y = myfunc(), or [y,z] = myfunc() ?

Write the first line as:

function [y,z] = myfunc()

If you only request one output, only the first output is returned by default.

Use nargout, something like this:

function [X,Y] = myfun()
if nargout==2
    X = 1;
    Y = 2;
else
    X = 0;
end
end

Simplest solution: set a default output value:

function [a,b] = myfn(x,y)
a = 1;
b = [];
if(x=y)
  b = 2;
end
end