Why do I receive an error using FEVAL when I do not have sufficient output arguments defined in the function I am calling?

 ??? One or more output arguments not assigned during call to 'feval'.
 Error in ==> D:\Applications\Matlab\6p5LCS\work\test_feval.m
 On line 3  ==> [a,b,c,d] = feval('local_test',1,2,3);

In R12.1 and previous versions of MATLAB the same function would produce the following warning

 Warning: One or more output arguments not assigned during call to 'feval'.
 > In D:\Applications\Matlab\6p5LCS\work\test_feval.m at line 3

Answer 1

[MathWorks Support Team]

You should define all explicit output arguments that are declared on the function declaration line. The behavior you are seeing occurs if you call any function that does not define all the variables declared in the function declaration line.

This is an intended behavior; The warning was strengthened to show errors in your user-written MATLAB code.