Create a new model and open it.

new_system('my_system')
open_system('my_system')

Create a symbolic expression.

syms x y z
f = x^2 + y^2 + z^2;

Use matlabFunctionBlock to create the block my_block containing the symbolic expression. matlabFunctionBlock overwrites existing blocks. Double-click the generated block to open and edit the function defining the block.

matlabFunctionBlock('my_system/my_block',f)

function f = my_block(x,y,z)
%#codegen

%    This function was generated by the Symbolic Math Toolbox version 7.3.
%    01-Jan-2017 00:00:00

f = x.^2+y.^2+z.^2;

Include the comment Version 1.1 in the block.

matlabFunctionBlock('my_system/my_block',f,'Comments','Version: 1.1')

function f = my_block(x,y,z)
...
%Version: 1.1
f = x.^2+y.^2+z.^2;

Save and close my_system.

save_system('my_system')
close_system('my_system')

Create a new empty model and open it.

new_system('my_system')
open_system('my_system')

Create a symbolic function.

syms x y z
f(x, y, z) = x^2 + y^2 + z^2;

Convert f to a MATLAB function block. Double-click the block to see the function.

matlabFunctionBlock('my_system/my_block',f)

function f = my_block(x,y,z)
%#codegen
f = x.^2+y.^2+z.^2;

Create a new empty model and open it.

new_system('my_system')
open_system('my_system')

Create three symbolic expressions.

syms x y z
f = x^2;
g = y^2;
h = z^2;

Convert them to a MATLAB function block. matlabFunctionBlock creates a block with three output ports. Double-click the block to see the function.

matlabFunctionBlock('my_system/my_block',f,g,h)

function [f,g,h] = my_block(x,y,z)
%#codegen
f = x.^2;
if nargout > 1
    g = y.^2;
end
if nargout > 2
    h = z.^2;
end

Create a new empty model and open it.

new_system('my_system')
open_system('my_system')

Create a symbolic expression.

syms x y z
f = x^2 + y^2 + z^2;

Generate a block and set the function name to my_function. Double-click the block to see the function.

matlabFunctionBlock('my_system/my_block',f,...
                    'FunctionName', 'my_function')

function f = my_function(x,y,z)
%#codegen
f = x.^2+y.^2+z.^2;

Create a new empty model and open it.

new_system('my_system')
open_system('my_system')

Create a symbolic expression.

syms x
r = x^2*(x^2 + 1);

Use matlabFunctionBlock to create the block my_block containing the symbolic expression. Double-click the block to see the function defining the block. By default, matlabFunctionBlock creates a file containing the optimized code.

matlabFunctionBlock('my_system/my_block',r)

function r = my_block(x)
%#codegen
t2 = x.^2;
r = t2.*(t2+1.0);

Disable the code optimization by setting the value of Optimize to false.

matlabFunctionBlock('my_system/my_block',r,...
                    'Optimize',false)

function r = my_block(x)
%#codegen
r = x.^2.*(x.^2+1.0);

Create a new empty model and open it.

new_system('my_system')
open_system('my_system')

Create a symbolic expression.

syms x y z
f = x^2 + y^2 + z^2;

Convert the expression to a MATLAB function block. By default, matlabFunctionBlock uses alphabetical order of input arguments when converting symbolic expressions.

matlabFunctionBlock('my_system/my_block',f)

function f = my_block(x,y,z)
%#codegen
f = x.^2+y.^2+z.^2;

Use the Vars argument to specify the order of the input ports.

matlabFunctionBlock('my_system/my_block',f,...
                    'Vars', [y z x])

function f = my_block(y,z,x)
%#codegen
f = x.^2+y.^2+z.^2;

Create a new empty model and open it.

new_system('my_system')
open_system('my_system')

Create a symbolic expression.

syms x y z
f = x^2 + y^2 + z^2;

Convert the expression to a MATLAB function block and specify the names of the output variables and ports. Double-click the block to see the function defining the block.

matlabFunctionBlock('my_system/my_block',f,f + 1,f + 2,...
                    'Outputs', {'name1','name2','name3'})

function [name1,name2,name3] = my_block(x,y,z)
%#codegen
t2 = x.^2;
t3 = y.^2;
t4 = z.^2;
name1 = t2+t3+t4;
if nargout > 1
    name2 = t2+t3+t4+1.0;
end
if nargout > 2
    name3 = t2+t3+t4+2.0;
end

Create a new empty model and open it.

new_system('my_system')
open_system('my_system')

Create a symbolic expression.

syms x y z
f = x^2 + y^2 + z^2;

Call matlabFunctionBlock using the name-value pair arguments to specify the function name, the order of the input ports, and the names of the output ports. Double-click the block to see the function defining the block.

matlabFunctionBlock('my_system/my_block',f,f + 1,f + 2,...
                    'FunctionName', 'my_function','Vars',[y z x],...
                    'Outputs',{'name1','name2','name3'})

function [name1,name2,name3] = my_function(y,z,x)
%#codegen
t2 = x.^2;
t3 = y.^2;
t4 = z.^2;
name1 = t2+t3+t4;
if nargout > 1
    name2 = t2+t3+t4+1.0;
end
if nargout > 2
    name3 = t2+t3+t4+2.0;
end