use matlab to Given a positive integer 'n', the task is to find a prime number greater than or equal to 'n'. Example 1 If given 'n' is 10, then the closest prime number greater than 10 is 11 at a distance of 1. So 11 must be returned. Example 2 If the given 'n' is 17, then the closest prime number is itself at a distance of 0. So 17 must be returned. The returned prime number must be greater than or equal to 'n'.

Here is one way to solve the problem using MATLAB:

function prime = find_closest_prime(n)
% Given a positive integer 'n', find the closest prime number greater than or equal to 'n'

% Check if n itself is a prime number
if isprime(n)
    prime = n;
    return
end

% Start checking for prime numbers starting from n and incrementing by 1
i = n;
while true
    if isprime(i)
        prime = i;
        return
    end
    i = i + 1;
end
end

This function checks if the input `n` itself is a prime number using the `isprime` function provided by MATLAB. If it is, then it returns `n` itself as the closest prime number. Otherwise, it starts checking for prime numbers greater than `n` by incrementing `i` by 1 until it finds a prime number using the same `isprime` function. Once it finds a prime number, it returns it as the closest prime number greater than or equal to `n`.