How to create a minus counter

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Kwan Zhao Jie
Kwan Zhao Jie 2018-3-12
评论： Kwan Zhao Jie 2018-3-13
on the code above i created a add counter
function patient_Callback(hObject, eventdata, handles)
counter2 = get(hObject, 'UserData') + 1;
set(hObject, 'UserData', counter2);
set(handles.Impt, 'String', sprintf('Number of Patients currently: %d\n', counter2));
but the minus code doesnt work
function patients_Callback(hObject, eventdata, handles)
counter2 = get(hObject, 'UserData') - 1;
set(hObject, 'UserData', counter2);
set(handles.Impt, 'String', sprintf('Number of Patients currently: %d\n', counter2));
guidata(hObject , handles);
What should i change to the minus code.
  10 个评论
显示 8更早的评论
Walter Roberson
Walter Roberson 2018-3-13
Impt_CreateFcn is missing.
For both patient_Callback and patients_Callback, you use
counter2 = get(hObject, 'UserData')
but notice that for patient_Callback, hObject is data attached to handles.patient, and for patients_Callback, hObject is data attached to handles.patients . You are not using the same data.
You should change patients_Callback to access handles.patient rather than hObject .

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回答（1 个）

Santosh Prasad Choudhury
Please try to check the user data deafult value and how you validate them for value less than 0? please let me know

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