msg = nargchk(low,high,number)
msg = nargchk(low,high,number) returns an error message if number is less than low or greater than high. If number is between low and high (inclusive), nargchk returns an empty matrix.
Use the function nargin to determine the number of input arguments passed to a function.
nargin,nargout
(c) Copyright 1994 by The MathWorks, Inc.