Error in code, parenthesis perceiving as comment for some reason

If a run the following code I get a following comment:

Line 17: A '(' might be missing a closing ')'.

causing invalid syntax at end of line. Line 17 is

Q_est = updateQ(...), 

and this warning also shows in line 18 and 19 too. Does anyone know what is the problem? Here we cannot see it, but if I run this code in MATLAB the last parenthesis is shown in green and perceived as a comment for some reason.

for i = 1:numIterations
    beta_est = updateBetaUsingCarterKohn(Y, X, alpha_est, beta_est, Q_est, R_est);
    
    Q_est = updateQ(...)
        R_est = updateR(...)
        alpha_est = updateAlpha(...)
        
end

Answer 1

[Stephen23]

Explanation: for some reason you seem to be running this literal code:

Q_est = updateQ(...)

instead of calling UPDATEQ etc. with any inputs that they require. The reason why the closing parenthesis is green like a comment is because it is a comment: you defined it as a comment by using the ellipsis, exactly as explained in the documentation:

https://www.mathworks.com/help/matlab/matlab_prog/continue-long-statements-on-multiple-lines.html

https://www.mathworks.com/help/matlab/matlab_prog/matlab-operators-and-special-characters.html

Solution: call the function with inputs, rather than with superfluous ellipses.