The recommended functions for validating the number of input and output arguments are narginchk(minargs, maxargs) and nargoutchk(minargs, maxargs), respectively. Each of these functions throws an error if the number of arguments falls outside the specified range. Therefore, there is no need to use the error function in combination with either of these functions.

To validate the number of input arguments, use narginchk. To validate the number of output arguments, use nargoutchk.