How to set simulink block parameters (customized) from GUI

Hi, I want to do this: in simulink I have included an entity generator block (from the SimEvents toolbox), in entity generator I wrote this matlab code:

persistent rngInit;
if isempty(rngInit)
   seed = 2346;
    rng(seed)
    rngInit=true;
end

% Exponential inter-arrival time dt
mean = 1/10;
dt = -mean*log(1-rand());

Then I created a GUI and from that I want to change the value of the parameter 'seed' inside the previous code and to do so I created in the GUI this callback:

function seed_Callback(hObject, eventdata, handles)
% hObject    handle to seed (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Hints: get(hObject,'String') returns contents of seed as text
%        str2double(get(hObject,'String')) returns contents of seed as a double
value=get(handles.seed,'string');
string1=value{1};
load_system('modelloPerProve');
set_param(['modelloPerProve/Entity Generator/Entity generation'],'seed',string);

It runs but it doesn't work. I can't undersatand how to reach the parameter.

Thanks for your help,

Chiara Cimino.

Answer 1

[ES]

I think you should remove assigning value to seed in your model.

persistent rngInit;
if isempty(rngInit)
   %seed = 2346;
    rng(seed)
    rngInit=true;
end
% Exponential inter-arrival time dt
mean = 1/10;
dt = -mean*log(1-rand());

and set the value of seed in base workspace using your gui callback.

function seed_Callback(hObject, eventdata, handles)
% hObject    handle to seed (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
% Hints: get(hObject,'String') returns contents of seed as text
%        str2double(get(hObject,'String')) returns contents of seed as a double
value=get(handles.seed,'string');
string1=value{1};
load_system('modelloPerProve');
evalin('base','seed = 1234')

[chiara cimino]

But I want to change the seed value from the gui with the number inserted by an operator in the edit text box.

do you know how to do it?

thank you,

Chiara