S function with function handle as class member of block.

Problem statement: I want to preload my function handel form mat file in level-2 s-function. After that, I want to call each iteration.

Code sample:

function msfcn_times_two(block)
% Level-2 MATLAB file S-Function for times two demo.

%   Copyright 1990-2009 The MathWorks, Inc.

  setup(block);
  
%endfunction

function setup(block)
  
  %% Register number of input and output ports
  block.NumInputPorts  = 1;
  block.NumOutputPorts = 1;

  %% Setup functional port properties to dynamically
  %% inherited.
  block.SetPreCompInpPortInfoToDynamic;
  block.SetPreCompOutPortInfoToDynamic;
 
  block.InputPort(1).DirectFeedthrough = true;
  
  %% Set block sample time to inherited
  block.SampleTimes = [-1 0];
  
  %% Set the block simStateCompliance to default (i.e., same as a built-in block)
  block.SimStateCompliance = 'DefaultSimState';

  %% Run accelerator on TLC
  block.SetAccelRunOnTLC(true);
  
  %% Register methods
  block.RegBlockMethod('Outputs',                 @Output);

  %% import function
  block.lam=load("lmbd.mat")
  
%endfunction

function Output(block)
  M = block.lam.Mfunc(0,0,0,0,0,0,0,0,0,0,0,0);
  block.OutputPort(1).Data = 2*block.InputPort(1).Data;
  
%endfunction

How to load function handle as class member?

Thanks!

Answer 1

[Sahas]

Hi @younghwa park,

As per my understanding, you would like to preload a function handle from a “.mat” file into a level-2 MATLAB S-function and call this function handle with each iteration.

This can be done by storing the function handle as a class member within the S-function. Utilize MATLAB’s “DWork Vector” for this by storing the function handle persistently across simulation steps.

Run the following command in the MATLAB Command Window and use the “msfcn_varpulse.m” file as a template and modify your code accordingly.

>> edit('msfcn_varpulse.m');

Refer to the MathWorks documentation below for more information on “DWork Vector” and detailed steps on how to use them for Level-2 MATLAB S-functions:

https://www.mathworks.com/help/simulink/sfg/dwork-matlab.html

I hope this is beneficial and help you call the function handles with each simulation step.