MATLAB: Get value from simulink model to matlab gui while simulink is running

get_paramguisimulnk

With respect to following post I have some doubts related to command get_param:

http://www.mathworks.com/matlabcentral/answers/23-how-can-i-update-a-gui-with-values-from-my-simulink-model-as-it-is-running

1) When I use this command it returns me empty vector. 2) Can we use this command for any block like display, demux and out or it has to be Gain block only?

Thanks Mitesh

Best Answer

I believe it can be done that way and it should apply to all types of blocks. Remember you can't just use get_param() alone, you need to set up the event listener and callback function. See Guy Rouleau's anser in this post. It points to the link from the Mathworks website.

http://www.mathworks.com/matlabcentral/answers/13992-problem-how-to-get-datas-from-integrator-block-in-simulink

Related Solutions

MATLAB: How to update a GUI with values from the Simulink model as it is running

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);

MATLAB: Input Arguments for Callback Function in a listener

If you do not need to use those inputs, then define your function using input placeholders:

 function updategui2(~,~)

https://www.mathworks.com/help/matlab/matlab_prog/ignore-function-inputs.html

FYI, the object handle is quite useful if you want to know the value or status of the calling object, e.g. what value a button or text box has.

Best Answer

Related Solutions

MATLAB: How to update a GUI with values from the Simulink model as it is running

MATLAB: Input Arguments for Callback Function in a listener

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