Creating a counter loop in MatLab, GUI?

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Amed
Amed 2013-1-25
编辑： Irwin2020 2018-11-22
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;
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Jan
Jan 2013-1-29
@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
Wouter 2013-11-7
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.

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采纳的回答

Jan
Jan 2013-1-29
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
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Jan
Jan 2013-1-29
It initialized the UserData property to 0. Otherwise the default is [].
Irwin2020
Irwin2020 2018-11-22
编辑：Irwin2020 2018-11-22
Jan , can you please help me create a counter -loop adding strings (Hex values)?

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更多回答（3 个）

Azzi Abdelmalek
Azzi Abdelmalek 2013-1-25
set(handles.text8,'string',num2str(a));
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Azzi Abdelmalek
Azzi Abdelmalek 2013-1-25
In opening function initialize
Set(handles.text8,'string','0')

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Amed
Amed 2013-1-25
编辑：Amed 2013-1-25
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
  1 个评论
Azzi Abdelmalek
Azzi Abdelmalek 2013-1-29
编辑：Azzi Abdelmalek 2013-1-29
The initialization is not in the right place. You should do it in your opening function, not in your pushbutton function

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Amed
Amed 2013-1-29
Anybody else have any ideas? Still not solved
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Jan
Jan 2013-1-29
编辑：Jan 2013-1-29
Please post comments in the comment section and not as an answer. Thanks.
simran
simran 2013-4-28
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.

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