How do i use vectors as input to the "interpreted Matlab Fnc" block?

I wrote a litle test function, which determines the scalar product of two vectors. It works fine when i use it in matlab. When i use the "interpreted Matlab Fnc" block in simulink it doesnt work properly. For a = 2 and b = 1 it gives me 2, which is correct. But when i use vectors instead of numbers like a = [2;2] and b = [1;1] i get 2 instead of 4.

I tried different combinations, but its always wrong... Since the "interpreted Matlab Fnc" block has only one input-port im using a Mux-block, may this be my mistake?

Does anybody have an idea what i'm doing wrong? thx for your help

Answer 1

[Azzi Abdelmalek]

a should be [2 2] instead of [2;2]

[Fedor]

ok it works now with 1x2 vectors, but when i try a 1x4 vector it fails again although i write [2 2 2 2]

[Azzi Abdelmalek]

[2;2]*[1;1]
Error using  * 
Inner matrix dimensions must agree.

[Fedor]

but thats not how i calculate the product in my function. I wanted to write my own code to test the "interpreted Matlab Fnc" block, because i will need it a lot. so my function is so:

function [ y ] = skalar( x,z )

y = 0;

if length(x) == length(z)

   for i = 1:length(x)
      y = y + x(i)*z(i); 
   end
else
    print('Invalid Input');
end

end

i think the mistake must be in simulink, since the function works just fine when i use it in the workspace.

[Kaustubha Govind]

Fedor: it might be a good idea to set a breakpoint in your code to understand how the inputs are passed in.