Syntax error in every function I wrote at Simulink Fcn block

Hi, I have 7 functions in my simulink model written via Fcn blok. I checked lots of times every function but I couldn't find any misstake. What can be the reason? Thanks!

[Fangjun Jiang]

providing an example would be helpful

[sinan kaya]

thanks Fangjun Jiang this is a function I get syntax error.

(kr*(u(1)+b2*sin(u(3))+a2*sin(u(2))-u(7))+ktr*(u(7)-u(15)))/mr

Answer 1

[Fangjun Jiang]

I tried it. Initially, it had "syntax error". But once I assigned the following variables, the error disappeared. I used a Constant block as the input to the Fcn block. The constant value is rand(15,1). I suspect that you don't have all the below variables assigned. The error message certainly didn't help that much.

kr=1;
b2=1;
a2=1;
ktr=1;
mr=1;

[Fangjun Jiang]

After that, if I run "clear mr", then the "syntax error" comes back. So, I believe that the cause is that you don't have all the needed parameters assigned.

[sinan kaya]

yeah you are right, two parameters were missed:) thank you so much!