Using vector inputs for MATLAB Function block for code generation

Lets assume I use the following functions within a "MATLAB Function block" in Simulink (see below).

If these two functions are within a "MATLAB Function block", only the optimisation_AD() is visible from Simulink.

optimisation_AD() has a vector input of type single, lets say input_var = ones(10:1) and a single output

function fun_out = optimisation_AD(input_var)

fun_out = Test_simple_fun(input_var);

end

function [y_output] = Test_simple_fun(x_input)

y_output_tmp = single(0);

for n = 1:length(x_input)

y_output_tmp = y_output_tmp + x_input(n);

end

y_output = y_output_tmp/length(x_input);

end

When I pass a vector (I use the tapped delay block) to optimisation_AD() as the input, the functin does not work.

It seems like, it is not possible to pass a vector to the "main function" of a "MATLAB Function block".

However, if I would define a vector within otimisation_AD() and pass it to Test_simple_fun(), as can be seen above,

it works. How is this possible?

I want to generate C-Code from the Matlab function block.