Creating a counter loop in MatLab, GUI?

Hello, i'm trying to create a loop counter that will add increments of 1 every time I click a pushbutton. I don't really have any code as of yet since i'm new to programming but i've figured how to detect the button being pushed, and display a number in the static text. It keeps displaying '1', how do I display 1,2,3,.....n for every push? Here is what I have so far. Thanks a bunch

    a = 0;
if (handles.pushbutton5)
    a = a + 1;
    set(handles.text8,'string',a);
end;

[Azzi Abdelmalek]

What "if true" is for?

[Jan]

@Azzi: As Walter has explained before when I've asked the same question, the "if true, ..., end" appears, when you hit the "code" button when no text is selected.

[Wouter]

And what if I want the option to count backwards?

I've tried creating a second pushbutton that produces:

counter = get(hObject, 'UserData') - 1;

However, no effect.

Answer 1

[Jan]

I would avoid mixing the string and the numerical representation, although both are equivalent in this case. So you can add in the opening function:

set(handles.pushbutton5, 'UserData', 0);

and in the callback of this pushbutton:

function pushbutton5_Callback(hObject, EventData, handles)
counter = get(hObject, 'UserData') + 1;
set(hObject, 'UserData', counter);
set(handles.text8, 'String', sprintf('%d', counter));

If the field "text8" is missing, see FAQ: incomplete handles struct

[Amed]

% --- Executes on button press in pushbutton5.
function pushbutton5_Callback(hObject, EventData, handles)
set(handles.pushbutton5, 'UserData', 0);
counter = get(hObject, 'UserData') + 1;
set(hObject, 'UserData', counter);
set(handles.text8, 'String', sprintf('%d', counter));

is what i wrote as the code. What do you mean adding into the 'opening function'

thanks

[Amed]

Thank you very much kind sir, it works. I'm just confused as to why I added

set(handles.pushbutton5, 'UserData', 0);

into opening function. What does that do for me?

[Jan]

It initialized the UserData property to 0. Otherwise the default is [].

[Irwin2020]

Jan , can you please help me create a counter -loop adding strings (Hex values)?

Answer 2

[Azzi Abdelmalek]

set(handles.text8,'string',num2str(a));

[Amed]

converting a from a num to a string did not do it.

    a = 0;
if (handles.pushbutton5)
    a = a + 1;
    set(handles.text8,'string',num2str(a));
end;

[Azzi Abdelmalek]

Because every time you have

a=0

Use

a=str2double(get(handles.text8,'string'))

instead of

 a=0

[Amed]

yes i understand the code is wrong. so it reads as a = 0 every time. how do i allow some memory of sorts to be stored, so it knows to keep adding intervals of 1 to every click?

 a=str2double(get(handles.text8,'string'));
if (handles.pushbutton5)
    a = a + 1;
    set(handles.text8,'string',a);
end;

I get NaN

[Azzi Abdelmalek]

Look at the above code

[Azzi Abdelmalek]

In opening function initialize

Set(handles.text8,'string','0')

Answer 3

[Amed]

Anybody else?

i initialized it as

set(handles.text8,'string','0')
a = str2double(get(handles.text8,'string'));
if (handles.pushbutton5)
    a = a + 1;
    set(handles.text8,'string',a);
end;

but get a constant '1' answer every click.. it will not add +1 to each click and display

[Azzi Abdelmalek]

The initialization is not in the right place. You should do it in your opening function, not in your pushbutton function

Answer 4

[Amed]

Anybody else have any ideas? Still not solved

[Jan]

Please post comments in the comment section and not as an answer. Thanks.

[simran]

put your initial value for counter in Property Inspector's User data property but not in pushbutton callback function. This will increment counter on every click of push button.