How can I update a GUI with values from my Simulink model as it is running?

I have a Simulink model and I would like to display the value of the output of certain blocks in my GUI.

Answer 1

[Deepti Sukhwani]

There is no direct way to access the runtime parameters of a Simulink model from a MATLAB GUI. To work around this issue, you need to create a function that will update the GUI with the desired model data at each time step. An outline of this procedure is as follows.

1. Create a GUI with a control that you would like to update with information from the model. In this example, we would like to see the output of the model's Gain block in the GUIs edit text window.

2. Create a model callback function that will register an event listener for the block in question. This function will be called every time the block is updated. We will use it to access the value of the Gain blocks output and pass them to the GUI. In this case we will use the models 'StartFcn' callback.

%The GUI handles are by default hidden, turn them on

set(0,'ShowHiddenHandles','on');

%Set up the arguments that will go into the gain block event callback listener

blk = 'mytestmdl/Gain';
event = 'PostOutputs';
listener = @updategui;

%Create the listener
h = add_exec_event_listener(blk, event, listener);

3. Create a MATLAB file function that will get the Gain block's runtime output parameter and pass it to the GUI.

function varargout = updategui(varargin)

%create a run time object that can return the value of the gain block's

%output and then put the value in a string.  

rto = get_param('mytestmdl/Gain','RuntimeObject');
str = num2str(rto.OutputPort(1).Data);

%get a handle to the GUI's 'current state' window
statestxt = findobj('Tag','curState');

%update the gui
set(statestxt,'string',str);

[Rinachi Garg]

Where should I declare the following commands:

%The GUI handles are by default hidden, turn them on set(0,'ShowHiddenHandles','on'); %Set up the arguments that will go into the gain block event callback listener blk = 'mytestmdl/Gain'; event = 'PostOutputs'; listener = @updategui; %Create the listener h = add_exec_event_listener(blk, event, listener);

I created a MATLAB file function updategui, but how should I call this function within GUI .m file?

[Kaustubha Govind]

Rinachi: As the answer suggests, you need to put the code in the model's 'StartFcn' callback. See Model Callbacks for information about the StartFcn callback.

[Chao]

How do I adapt the updategui.m for a plot on an axes?