Unsing workspace data in matlab function block in simulink

For example, when I have workspace data

A=3;
B=7;

I want to make an Matlab function block in simulink

with 3 inputs and 1 output for example

function f = my_block(x,y,z)
%#codegen
syms A B
%    This function was generated by the Symbolic Math Toolbox version 6.2.
%    11-Jan-2016 15:08:47
f = (x+y)*A + B*z;

and for many cases that various values of A and B

I want to do the simulations by using that simulations

but that makes error

Undefined function or variable 'A'.
Function 'my_block' (#45.189.190), line 8, column 11:
"A"
Launch diagnostic report.
Component: MATLAB Function | Category: Coder error

I just mentioned about very simple example but I want to use very many variables in workspace (for example 8 by 8 matrix equations)

how to solve this error

Answer 1

[Walter Roberson]

Symbolic toolkit cannot be compiled by MATLAB Compiler or MATLAB Coder. MATLAB Function blocks may be compiled in anything other than Normal mode. You need an Interpreted MATLAB block to use Symbolic Toolkit. Even then I do not promise that a symbolic object can be conveyed by a signal.