To open the MATLAB Function Block Editor, double-click the MATLAB Function block. A default function appears in the MATLAB Function Block Editor with two variables: one input and one output argument.

Define the function inputs and outputs by editing the function declaration statement:

function [mean, stdev] = stats(vals)

This statement defines a function called stats with three variables. The statement defines an input argument, vals, and two output arguments, mean and stdev.

On a new line after the function declaration statement, add the following code:

% Calculates a statistical mean and a standard
% deviation for the values in vals.

len = length(vals);
mean = avg(vals,len);
stdev = sqrt(sum(((vals-avg(vals,len)).^2))/len);
plot(vals,"-+");

function mean = avg(array,size)
mean = sum(array)/size;

Exit the block. The block updates the port names. The function outputs mean and stdev correspond to block output ports mean and stdev and the function input vals corresponds to the block input port vals.

Complete the connections to the MATLAB Function block as shown.

Save the model as call_stats_block2.

Double-click the MATLAB Function block.

Open the Symbols pane and the Property Inspector. In the Function tab, click Edit Data.

The Symbols pane displays the variable names in the Name column. The Type column determines the function argument port assignment and where it appears in the function declaration statement. In this example, vals is assigned to an input port. mean and stdev are assigned to output ports. If you change the Type entry for either variable, the function declaration statement also changes.

Check the properties for vals. In the Symbols pane, click the row for vals. The Property Inspector updates to show the properties for vals. The Scope property matches the Type column.

Only some properties can be inherited: Size, Unit, Complexity, and Type. Variables indicate that they inherit these properties when Size is -1, Unit is inherit, Complexity is Inherited, and Type is Inherit: Same as Simulink. In this example, vals uses these values for Size and Type.