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popup menu callback not plotting graph

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H.Hogarth
H.Hogarth 2016-4-14
回答： Walter Roberson 2016-4-14
Hi, so this is only the start of my design and i wanted to test if the data stored in the dropdown menu is plotted.
However when i run the code and select a item from the dropdown menu nothing is plotted, there are no error codes or anything. Here is my code below:
function liquids_Callback(hObject, eventdata, handles)
% hObject handle to liquids (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.liquids,'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;
otherwise
P=10.^(S.A-(S.B./(S.C+S.T)))
plot(S.T,P)
end
set(handles.liquids, 'UserData', S);
The liquids_Callback section is underlined in red saying it might not be in uses, but i dont understand why it wouldnt be in use.
Many Thanks.

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回答（1 个）

Walter Roberson
Walter Roberson 2016-4-14
You are only plotting if an entry after the third one is selected. The other entries set up values in the structure S that are written to the UserData, but the UserData is not retrieved before doing the plotting.
You should put in a breakpoint at the switch statement and see if you are even getting there, and single step to see what is happening.

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