How to make a button works depending on which button a selected before?

In my GUI, first there are four options of button, depending on which is chosen i want that another button (when is selected) run certain things than will be shown in some text boxes. (all buttons are pushbuttons)

Answer 1

[Adam Danz]

This sounds like a potential mess but I'll give it the benefit of doubt and suggest a solution. But please make sure your idea makes sense and that a naive user will understand how to use the GUI.

Let's say your 4 option buttons are b1, b2, b3, b4 and your text button is mainButton. One of the properties of mainButton (and any button) is UserData and you can store anything you want in there and reference it later when needed.

Within each of the option button callback functions, store information about which button was just pressed in the UserData field of the mainButton handle. That would look something like this:

function b1CallbackFunction(hObject, eventdata, handles)
     handles.mainButton.UserData = 'b1';  
end

You'll do that for each option button.

Then in the callback function of mainButton you'll need to access the UserData and create a switch-case that controls the different actions take for each option button.

That would look something like this

function mainButtonCallbackFunction(hObject, eventdata, handles)
   mostRecentButton = hObject.UserData; 
   switch mostRecentButton
        case 'b1'
              % do something
        case 'b2'
              % do something
        case 'b3'
              % do something
        case 'b4'
              %do something 
        otherwise
              error('Unexpected button handle')
     end

A couple of important things to think about:

• What happens if the mainButton is pressed before one of the option buttons are pressed? You'll need to set up the UserData in mainButton with a default value when the GUI is created.
• Will there be any visual indication which button was most recently pressed? You could change the color of the mainButton or have some text near the button...
• Instead of using 4 option buttons, consider using a popup menu or some other GUI component that is designed for such a task (again, I'm giving you the benefit of doubt that this setup makes sense for your project but I'm skeptical).

All of this code was written 'on the fly' and not tested.

[Andrea Salazar]

It works!, thank you so much :) but now i have some problems.. now the buttons don't conflict with each other, when i select the first one, it works, but when i select another button, this message appear "Index exceeds matrix dimensions." and i'm not sure what does it means. I know that using a pop up menu would be easier, but i was asked to do it in that way, and i'm so new in this platform, i had so many doubts The thing is that depending on which button is chosen, i call an external function, the lines are exactly the same as above for the first button, don't understand why there is an error.

[Adam Danz]

Could you share the relevant code that produces the error?

[Andrea Salazar]

There are the GUI code and one of the functions.. if you could help me, i'll be so thankful

[Adam Danz]

I'd be happy to but you'll need to help me help you by telling me where to start in your code. I'd like to know the line that produces the error.

[Andrea Salazar]

the error occur in the line where function C is, line 162, where i call the matrix using the variables from the text boxes

[Adam Danz]

Function C only has 52 lines, though.

[Andrea Salazar]

sorry, its 673, but in the GUI code, there is any error in function C

[Adam Danz]

Lines 667 bto 673 in intento1000.m:

    case 'b2'
        A=str2double(get(handles.C_A,'String'));
        B=str2double(get(handles.C_B,'String'));
        C=str2double(get(handles.C_t,'String'));
        D=str2double(get(handles.C_R,'String'));

        [P_C]=C(A,B,C,D);

In line 4, above, and according to your error message, C is a matrix, having 2 dimensions. In the last line above, you are trying to index C as if it had 4 dimensions and the values of A, B, C, D might not even index correctly into C. Does that make sense?

[Andrea Salazar]

P_C is a matrix that have 2 dimensions indeed, it is the result of a function C with 4 input variables, that is why A,B,C,D are there, they are the input variables from the text boxes..

[Adam Danz]

I understand that you have a function C with 4 inputs; but Matlab probably doesn't understand that because you are defining a variable 'C' just prior to calling your function 'C'. 'C' refers to a variable in your code, not a function. I could have made that clearer in my previous comment.

C=str2double(get(handles.C_t,'String'));
...
C(A,B,C,D)

[Andrea Salazar]

i changed all the variables, but now the error is this " The class handle has no property or method named 'text100'." but it does, all the following lines are the same for all the cases, it works for case 1, but does not work for the rest

[Adam Danz]

In your function boton_ok_Callback(), you have a lot of redundant code within each case and that can lead to inconsistencies. So I recommend cleaning that up before proceeding with any troubleshooting.

For each case, you are setting the same set of text strings in your GUI. I've created an additional function that controls that. Your code below calls that new function within each case rather than having a bunch of redundant code. I suggest you implement this, test it, and if the problem persists, share the updated code, an exact copy of the error message, and indicate what line is producing the error.

function boton_ok_Callback(hObject, eventdata, handles)
% hObject    handle to boton_ok (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
mostRecentButton=hObject.UserData;
switch mostRecentButton
    case 'b1'
        A=str2double(get(handles.G_A,'String'));
        B=str2double(get(handles.G_B,'String'));
        C=str2double(get(handles.G_C,'String'));
        D=str2double(get(handles.G_t,'String'));
        E=str2double(get(handles.G_R,'String'));

          [P_G]=G(A,B,C,D,E);

          setStrings(P_G);

      case 'b2'
          A=str2double(get(handles.C_A,'String'));
          B=str2double(get(handles.C_B,'String'));
          C=str2double(get(handles.C_t,'String'));
          D=str2double(get(handles.C_R,'String'));

          [P_C]=C(A,B,C,D);

          setStrings(P_C);

      case 'b3'
          A=str2double(get(handles.O_A,'String'));
          B=str2double(get(handles.O_B,'String'));
          C=str2double(get(handles.O_C,'String'));
          D=str2double(get(handles.O_t,'String'));
          E=str2double(get(handles.O_R,'String'));

          [P_Omega]=Omega(A,B,C,D,E);

          setStrings(P_Omega);

      case 'b4'
          A=str2double(get(handles.A_A,'String'));
          B=str2double(get(handles.A_t,'String'));
          C=str2double(get(handles.A_R,'String'));

          [P_Angulo]=Angulo(A,B,C);

          setStrings(P_Angulo);

      otherwise
          error('Unexpected button handle')
  end

New function:

function setStrings(values)
set(handles.text100,'String',values(1,1));
set(handles.text101,'String',values(1,2));
set(handles.text102,'String',values(1,3));
set(handles.text103,'String',values(1,4));
set(handles.text104,'String',values(1,5));
set(handles.text105,'String',values(1,6));
set(handles.text106,'String',values(1,7));
set(handles.text107,'String',values(1,8));
set(handles.text108,'String',values(1,9));
set(handles.text109,'String',values(1,10));
set(handles.text110,'String',values(1,11));
set(handles.text111,'String',values(1,12));
set(handles.text112,'String',values(1,13));
set(handles.text113,'String',values(1,14));
set(handles.text114,'String',values(1,15));
set(handles.text115,'String',values(1,16));
set(handles.text116,'String',values(1,17));
set(handles.text117,'String',values(1,18));
set(handles.text118,'String',values(1,19));

[Adam Danz]

As I mentioned, I'll need a copy of the full error message and the line that is causing the error.

[Andrea Salazar]

I changed text100 for text45

The class handle has no property or method named 'text45'.

Error in intento1000>setStrings (line 632) set(handle.text45,'String',values(1,1));

Error in intento1000>boton_ok_Callback (line 669) setStrings(P_G);

Error in gui_mainfcn (line 95) feval(varargin{:});

Error in intento1000 (line 42) gui_mainfcn(gui_State, varargin{:});

Error in @(hObject,eventdata)intento1000('boton_ok_Callback',hObject,eventdata,guidata(hObject))

Error while evaluating UIControl Callback

[Andrea Salazar]

I think one of the mistakes is "handle" instead of "handles".. but still there is the same error

Answer 2

[Andrea Salazar]

The error persists.. :(.. i changed the tag, erase the textbox and changed tag, but still does not work, now nothing work, not even G

 function boton_ok_Callback(hObject, eventdata, handles
mostRecentButton=hObject.UserData;
switch mostRecentButton
    case 'b1'
        A_1=str2double(get(handles.G_A,'String'));
        B_1=str2double(get(handles.G_B,'String'));
        C_1=str2double(get(handles.G_C,'String'));
        D_1=str2double(get(handles.G_t,'String'));
        E_1=str2double(get(handles.G_R,'String'));

        [P_G]=G(A_1,B_1,C_1,D_1,E_1);

        setStrings(P_G);

    case 'b2'
        A_2=str2double(get(handles.C_A,'String'));
        B_2=str2double(get(handles.C_B,'String'));
        C_2=str2double(get(handles.C_t,'String'));
        D_2=str2double(get(handles.C_R,'String'));

        [P_C]=C(A_2,B_2,C_2,D_2);

        setStrings(P_C);

    case 'b3'
    A_3=str2double(get(handles.O_A,'String'));
    B_3=str2double(get(handles.O_B,'String'));
    C_3=str2double(get(handles.O_C,'String'));
    D_3=str2double(get(handles.O_t,'String'));
    E_3=str2double(get(handles.O_R,'String'));

    [P_Omega]=Omega(A_3,B_3,C_3,D_3,E_3);

    setStrings(P_Omega);

    case 'b4'
    A_4=str2double(get(handles.A_A,'String'));
    B_4=str2double(get(handles.A_t,'String'));
    C_4=str2double(get(handles.A_R,'String'));

    [P_Angulo]=Angulo(A_4,B_4,C_4);

    setStrings(P_Angulo);

    otherwise
        error('Unexpected button handle')

end

function setStrings(values)
  set(handle.text100,'String',values(1,1));
  set(handle.text101,'String',values(1,2));
  set(handle.text102,'String',values(1,3));
  set(handle.text103,'String',values(1,4));
  set(handle.text104,'String',values(1,5));
  set(handle.text105,'String',values(1,6));
  set(handle.text106,'String',values(1,7));
  set(handle.text107,'String',values(1,8));
  set(handle.text108,'String',values(1,9));
  set(handle.text109,'String',values(1,10));
  set(handle.text110,'String',values(1,11));
  set(handle.text111,'String',values(1,12));
  set(handle.text112,'String',values(1,13));
  set(handle.text113,'String',values(1,14));
  set(handle.text114,'String',values(1,15));
  set(handle.text115,'String',values(1,16));
  set(handle.text116,'String',values(1,17));
  set(handle.text117,'String',values(1,18));
  set(handle.text118,'String',values(1,19));
end

[Andrea Salazar]

I return for the old code and add that missing "S" in handles, it works!!!!!!, thank you so much for your help!, and sorry for any inconvenience

[Adam Danz]

Good job! I still think you should use the cleaner version with less redundancies. All you need to do is make sure all of the " handle " typos are " handles ". I've edited that in my comment above.