How to export simulink data to workspace during simulation?

Question

I want to retrieve the data from simulink during simulation, and use serial network function to send these data to another program. Because I need to use another program to do some tricks and send command back to simulink, so I have to get data from simulink during runtime so that another program can make the right command.

I've tried using To Workspace block to export the data.

However, I can only got value in the very beginning of the simulation.

And I've also tried using scope and change some properties: check Save Data To Workspace and Uncheck Limite data to Last.

First, I started simulation, and I found the ScopeData didn't appear in the Workspace. Only when I stop simulation, ScopeData would appear in workspace.

And after that, I can use ScopeData.signals.values to get values.

But what I want is: when I start simulation, ScopeData would appear in workspace so that I can send these data to other program.

Does anyone know how to achieve this?

I found this page might be helpful, but I still don't know how to continuously export data during simulation.

Answer 1

Use get_param to read data from just at the current time. Also to send the data back to Simulink with set_param of a gain or another block.

An example of get_param

First load and start the simulation:

load_system('myModel')
set_param('myModel','SimulationCommand','Start');

To read data on any line of your simulink model:

1. Get a simulink block object (let's try a Clock with the name Clock):

   block = 'myModel/Clock';
   rto = get_param(block, 'RuntimeObject');
   

2. Then get the data on its first (or any) output port (or input) of that block.

   time = rto.OutputPort(1).Data;
   

You could do the reading, in a timer callback.

Also this might be helpful: Command Line Functionality for Simulink