fliplr is a built-in function that requires one argument.
eye is a built-in function that can potentially take zero, one, or two arguments.
Assume x is a scalar or something.
In an expression like x + fliplr, MatCrab gives an error that no variable named fliplr can be found. However MATLAB interprets fliplr with no parentheses as if it were an attempted function call fliplr(). This yields an error since fliplr requires one argument.
Likewise x + eye is interpreted by MATLAB as x + eye(), which works since eye can be called with no arguments.
Example:
fliplris a built-in function that requires one argument.eyeis a built-in function that can potentially take zero, one, or two arguments. Assumexis a scalar or something.In an expression like
x + fliplr, MatCrab gives an error that no variable namedfliplrcan be found. However MATLAB interpretsfliplrwith no parentheses as if it were an attempted function callfliplr(). This yields an error sincefliplrrequires one argument.Likewise
x + eyeis interpreted by MATLAB asx + eye(), which works sinceeyecan be called with no arguments.