Button group alter values
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Hi, so i have a popup menu that has the data stored within it as different cases. However i also have a button group which i want to use to change the units of the data and replot it. The first section is all fine, it plots the graph as i want it, the code can be seen below.
function choose_Callback(hObject, eventdata, handles)
% hObject handle to choose (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
switch get(handles.choose,'Value')
case 1
S.A=8.021;
S.B=1936.01;
S.C=258.451;
S.Tmin=18;
S.Tmax=118;
S.T=S.Tmin:((S.Tmax-S.Tmin)/100):S.Tmax;
case 2
S.A=8.021;
S.B=1936.01;
S.C=258.451;
S.Tmin=18;
S.Tmax=118;
S.T=S.Tmin:((S.Tmax-S.Tmin)/100):S.Tmax;
case 3
S.A=7.11714;
S.B=1210.595;
S.C=229.664;
S.Tmin=-13;
S.Tmax=55;
S.T=S.Tmin:((S.Tmax-S.Tmin)/100):S.Tmax;
end
S.P=10.^(S.A-(S.B./(S.C+S.T)));
plot(S.T,S.P)
set(handles.choose, 'UserData', S);
The problem arrises when i try to use the button group;
function pressureset_SelectionChangedFcn(hObject, eventdata, handles)
% hObject handle to the selected object in pressureset
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
sel_obj = get(handles.pressureset, 'selectedobject');
avial_object = get(handles.pressureset,'children');
if sel_obj==avial_object(1)
set(handles.choose,'value')
elseif sel_obj==avial_object(2)
set(handles.choose,'value', S.P.*(101.325/760))
I get the error undefined variable S.T, any idea how i can bring over the data from the first section? Many Thanks.
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回答(1 个)
Rajesh Dubal
2016-4-18
The error occurs because the scope of the variable S is locally restricted to the function choose_Callback. What I personally do is save these in the handles structure.
Here is what you can do :
function choose_Callback(hObject, eventdata, handles)
% hObject handle to choose (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
switch get(handles.choose,'Value')
case 1
handles.S.A=8.021;
handles.S.B=1936.01;
handles.S.C=258.451;
handles.S.Tmin=18;
handles.S.Tmax=118;
handles.S.T=S.Tmin:((S.Tmax-S.Tmin)/100):S.Tmax;
case 2
handles.S.A=8.021;
handles.S.B=1936.01;
handles.S.C=258.451;
handles.S.Tmin=18;
handles.S.Tmax=118;
handles.S.T=S.Tmin:((S.Tmax-S.Tmin)/100):S.Tmax;
case 3
handles.S.A=7.11714;
handles.S.B=1210.595;
handles.S.C=229.664;
handles.S.Tmin=-13;
handles.S.Tmax=55;
handles.S.T=S.Tmin:((S.Tmax-S.Tmin)/100):S.Tmax;
end
handles.S.P=10.^(handles.S.A-(handles.S.B./(handles.S.C+handles.S.T)));
plot(handles.S.T,handles.S.P)
set(handles.choose, 'UserData', handles.S);
guidata(hObject, handles); %to update the handles structure
And the button callback
function pressureset_SelectionChangedFcn(hObject, eventdata, handles)
% hObject handle to the selected object in pressureset
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
sel_obj = get(handles.pressureset, 'selectedobject');
avial_object = get(handles.pressureset,'children');
if sel_obj==avial_object(1)
set(handles.choose,'value')
elseif sel_obj==avial_object(2)
set(handles.choose,'value', handles.S.P.*(101.325/760))
guidata(hObject, handles); %to update the handles structure
2 个评论
Rajesh Dubal
2016-4-19
You need to plot the curve again in the pressureset button callback, because you are not updating the plot anywhere in that callback.
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