I am not sure why my function is undefined for input arguments double.

% Enter the commands for your function here.  

x = random_number

function [check_range] = numberChecker(random_number, check_range)
    if (random_number < 10 & random_number > 0)
        check_range = 1
    else
        check_range =-1
    end
end

Answer 1

[Chunru]

x = rand([-20 20]);  % generate random number in range [-20 20]

% call the function
% output    function_name   input_argument
check      = numberChecker(       x        )

check = -1

function [check_range] = numberChecker(random_number)
    if (random_number < 10 & random_number > 0)
        check_range = 1;
    else
        check_range =-1;
    end
end