What do end-of-line commas do in Matlab?

Question

This is hard to look up: what do the end-of-line commas do in Matlab? In the couple of small tests I've done, they don't seem to make the code behave any different. I'd like to know because they're all over in this code I didn't write (but have to maintain).

Examples of what I mean:

if nargin<1,
    % code
end

if isError,
    % code
end

try,
    % code
    while 1,
        % even more code
    end
catch,
    % code
end

Answer 1

As others have pointed out, commas at the end of a line are unnecessary. They are really just for separating statements that are on the same line. mlint and the Editor will even give you a warning if you use one without needing it:

>> mlint comma_test.m
L 1 (C 4): Extra comma is unnecessary.