simulink & Matlab-Fcn :undefined input argument error

I'm working on a Simulink model containing a MATLAB Fcn block. For example in a function like 'TEST' ,

function z = TEST(x,y)
u = round(x);
v = round(y);
z = u + v;

I have to define input variables of the block at the beginning of the function because this error is occurred:

??? Error due to multiple causes.

Caused by:
    Input argument "y" is undefined.
    Error evaluating MATLAB function in 'TEST/MATLAB Fcn'

But I can not define "y" because the "x" and "y" are supposed to be defined during the simulation…

How can I send input variables of the MATLAB Fcn block to the function that is written for it?

Thank you.

Answer 1

[Kaustubha Govind]

Does the MATLAB Fcn block show up with two input ports on the Simulink model? I suspect that you may have unwittingly configured "y" as a parameter. To verify this, double-click on the block to open the Editor window, select Tools>Edit Data/Ports. Then select "y" on the left pane and ensure that "Scope" is set to "Input".