How to set simulink model parameter from GUI during simulation?

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Po-Jen
Po-Jen 2013-6-4
评论： rangan 2014-7-22
I want to set the gain(value of K) in the simulink block when this model is simulating.
I created a GUI contains a button and an edit text(tagged "text_box"), and the callback function of this button will set the gain by specifying the K in base work space.
% --- Executes on button press in FK_button.
function FK_button_Callback(hObject, eventdata, handles)
% hObject handle to FK_button (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
global K;
text=get(handles.text_box, 'String');
value = str2double(text);
K = value;
However, the simulink block only read the value of K in work space when I started simulation. During the simulation, if I press the button, the K value in base work space would change to the value I set, but the value of K in simulink wouldn't change.
I've also tried using set_param API to change the K in simulink by
% --- Executes on button press in FK_button.
function FK_button_Callback(hObject, eventdata, handles)
% hObject handle to FK_button (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
global K;
text=get(handles.text_box, 'String');
value = str2double(text);
%gui_variable is the model file name
set_param('gui_variable/Gain','Gain', value);
But I'll got error saying:
Error using robotics_gui_2>FK_button_Callback (line 429)
Invalid setting in Gain block 'Gain' for parameter 'Gain'
What can I do to alter K in simulink during simulation?
  1 个评论
rangan
rangan 2014-7-22
I had the same problem but solved it using this
value = get(hObject,'String')
string = value{1} // Converting cell to string
set_param([bdroot '/Gain'],'Gain',string)

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采纳的回答

Ilham Hardy
Ilham Hardy 2013-6-4
set_param('gui_variable/Gain','Gain', value);
Is value string?

更多回答（1 个）

Chandrasekhar
Chandrasekhar 2013-6-4
In the callback function 'function FK_button_Callback(hObject, eventdata, handles)' write the following code assignin('base', 'K', val); // val will be the value that you want to give for the gain.
the gain block in the Simulink model will read the K value from the workspace.
  4 个评论
显示 2更早的评论
Po-Jen
Po-Jen 2013-6-4
I've tried before I left the comment, but it doesn't work. It's effect is the same as using K = value; in my callback function.
Kaustubha Govind
Kaustubha Govind 2013-6-4
Po-Jen: Is the model running when the value of K changes in the base workspace? If yes, you need to update the model using set_param('modelname', 'SimulationCommand', 'update') to force Simulink to notice the new value.

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