Restrict Input Size Changes for Inputs

Restrict the size of all inputs by adding the isInputSizeMutableImpl method and returning false. By adding this method, users of the System object cannot change the size of inputs while the System object is in use.

function flag = isInputSizeMutableImpl(obj,~)
    flag = false;
end

To avoid a warning about unused variables, this examples uses ~ as the second input argument. For more information about using ~ in place of arguments, see Input Arguments and ~ in Method Definitions.

Restrict Input Size Changes for One Input

This example shows how to write the isInputSizeMutableImpl method to only restrict one input. isInputSizeMutableImpl returns true for all inputs except input one.

methods (Access = protected)
    function flag = isInputSizeMutableImpl(obj,index)
        if index == 1
            flag = false;
        else
            flag = true;
        end
    end
end