I am newbei matlab coder. i want to put a limit range in gui edit text and also want to update this value in simulink model i dit it but the value didn't update when i enter the value in edit text????? Any help is appreaciable....

input = str2num(get(hObject,'String'));
if (isempty(input))
     set(hObject,'String','1')
    warndlg('Input must be numerical');
end

x = get(hObject,'String');  % get text from handles structure

try

        y = x{1};               % cell to string

        z = str2num(strtok(y));         % string to number

catch

        z = str2num(strtok(x));          % string to number

end

lower_limit = 1;

upper_limit = 2000;

%Output equals value of z if z falls between the bounds set by lower_limit

%and upper_limit. Otherwise it is 0 or an empty array

output = z*(z < upper_limit)*(z > lower_limit);

%If z does not fall within the bounds set by the limit parameters or is an

%empty array

if isempty(output) | (~output)

        %Set the output value to the limit value closest to z

        output = lower_limit*(z < lower_limit) + upper_limit*(z > upper_limit);

        %If there is no value in z, set the output value to the lower limit of

        %the desired bounds

        if isempty(output)

            output = lower_limit;

        end

        %Create a message string and initiate a message box informing the user

        %to enter a value within the limits of the defined range

        str = sprintf('Enter a number between %d and %d', lower_limit, upper_limit);

        msgbox(str);

end

%Set the value of the text box to the new value, which lies within the

%value range

set(hObject,'String',{num2str(output(1))}); 

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

handles=guidata(hObject);
val=get(hObject,'string');
%put the value to text
set(handles.edit_period,'string',val);
set(handles.slider_period,'value',str2double(val));
%Update SIM model
set_param('DCDCconverter/Enabled Subsystem/period','value',num2str(val));
set_param('DCDCconverter/Enabled Subsystem1/period1','value',num2str(val));
set_param('DCDCconverter/Enabled Subsystem2/period2','value',num2str(val));
set_param('DCDCconverter/Enabled Subsystem3/period','value',num2str(val));
guidata(hObject,handles);

Answer 1

[Dennie]

str = get(hObject,'String');
newValue = str2double(str);

% Do the change if it's valid
if ~isnan(newValue)&& newValue>=-40 && newValue<=95

      %     poke the new value into the model
      assignin('base','name',newValue) % assign in matlab workspace 

   else
      %     throw up an error dialog
      estr = sprintf('%s is an invalid value for ... Only values allowed between -40 and 95. value is set to default (23).',str);
      errordlg(estr,'Parameter Error','modal');

      %     reset the edit box to the old value
      set(hObject,'String','23');
      assignin('base','name',23);
  end

This contains everything you want to know I believe. First you extract the value, then you check for validity, if it is valid you assign the value where you want ( assignin() for matlab workspace and setparam() for Simulink)

If the value is not valid, you notify the user using an error dialog and reset the value to a default.

Best regards, Dennie

[Mohammad Abu Bakar Siddique]

hi Dennie thanks a lot

It's working and i want ask you one more thing how could i enable a button after i load tha model when i start the gui it disable but after i load tha model it is not enable.

[Dennie]

Hi Mohammad,

assignin allows you to assign a variable in a defined work space. the command 'base' stands for the workspace where you want to save, so base workspace means the matlab workspace. the 'name' variable is the name you give it, for example:

assignin('base', 'test1',12) ;

results in the variable test1 with value 12 to be saved in the workspace of matlab. If you want to save the value in a Simulink block you must use setparam(), for example:

set_param('modelname/submodel/blockname' ,'Value','12');

this will change the value of the designated block to 12. This works for constant blocks, if you want to change the values of gains or other blocks, you will need to change the 'value' command to the right one, e.g. 'gain' for gain blocks

[Mohammad Abu Bakar Siddique]

hi Dennie thanks a lot

It's working and i want ask you one more thing how could i enable a button after i load tha model when i start the gui it disable but after i load tha model it states remain.

[Dennie]

I'm not sure what you mean. However, this is the code for enabling/disabling buttons in the GUI

set(handles.<tag_of_button>,'Enable','On') % to enable
set(handles.<tag_of_button>,'Enable','Off') % to disable

This works for basically every property of gui items

[Mohammad Abu Bakar Siddique]

HI Thanks a lot again i use this code and it works finely.and one more thing how could I update a edit text value in simulink model after pushing a pushbutton??? i can update this in manually but is it possible to do with a pushbutton ....after when i push a push button then edit text value autometically updated to the simulink model.....thanks in advance

function edit_topo_Callback(hObject, eventdata, handles)

set(0,'ShowHiddenHandles','on'); handles=guidata(hObject); val=get(hObject,'string'); %put the value to text set(handles.edit_topo,'string',num2str(val));

%Update SIM model set_param('DCDCconverter/Constant','value',num2str(val));

guidata(hObject,handles);

% --- Executes on button press in pushbutton_select. function pushbutton_select_Callback(hObject, eventdata, handles) % hObject handle to pushbutton_select (see GCBO) % eventdata reserved - to be defined in a future version of MATLAB % handles structure with handles and user data (see GUIDATA)

handles=guidata(hObject);

 guidata(hObject,handles);

here is the code what i use