Class in Matlab function block of simulink

Hi, I am trying to define a class in matlab function block in simulink but it did not accept it. for example I write

 F.max=4;
 F.min=3;

it will accept the first definition but for the second it will return the class already defined cant be redifined or reused.

Please advise if I can define a class in this block.

Thank you,

Answer 1

[Walter Roberson]

F = struct('max', 4, 'min', 3);