How can I implement the following function block

I need to implement the function block shown. I used user defined function but ran into a few problems. variables are in a script/and workspace m and l. The u(i...) are inputs to the block. The error is that the variable is not defined as shown in 2nd image

Answer 1

[Eric Delgado]

Just pass all the arguments to your function, not only the array "u".

function output = NameOfYourFunction(m, I, u)

    arguments
        m double = 1
        I double = 2
        u double = [45,45]
    end
    
    output = m * I * ( u(2)^2) * cos(u(1)) * sin(u(1));
end