i am trying to build a gui in which first popupmenu1 having code which gives results as 'rs' and i want to pass that result to next popupmenu2 i have used guidata to do so but i am getting error " reference to non existance field "

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rahul ahire 2016-3-15

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https://ww2.mathworks.cn/matlabcentral/answers/273677-i-am-trying-to-build-a-gui-in-which-first-popupmenu1-having-code-which-gives-results-as-rs-and-i-w

关闭： MATLAB Answer Bot 2021-8-20

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code is

function popupmenu1_Callback(hObject, eventdata, handles)
switch get(handles.category,'string')
case 'Tomato' % User selects Peaks.
a=imread('picview_tmpEnvironmental214.jpg'); 
b=a;
a=rgb2gray(a);
a=im2bw(a,.5);
[m,n]=size(a);
a=~a;
figure,
imshow(a);
count=0;
   for i=1:m
     for j=1:n
         if(a(i,j)==1)
              count=count+1;
         end
      end
   end
     a=b;
   [rows cols plane] = size(a); 
   rplane = a( : , : ,1); 
   gplane = a( : , : ,2); 
   bplane = a( : , : ,3); 
   flag=0;
       for x=1:1:rows;
           for y=1:1:cols
     if ((128 < rplane(x,y) & rplane(x,y) <= 255) & (0 < gplane(x,y) & gplane(x,y) <= 128) & (0 < bplane(x,y) 
  & bplane(x,y) <= 128))
                                              flag=1+flag;
               end
           end
      end
    K=count;
    %K=rows*cols-%no of white or black pixels(that meance pixels other than fruit pixels);
    rs = (flag/K)*100;
   _ *handles.rs=rs;
   guidata(hObject,handles)*_
   case 'Mango' 
   case 'Apple ju ju be'    
   case 'Orange'
   otherwise;
   end
function popupmenu2_Callback(hObject, eventdata, handles)
   rs3=handles.rs;

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Adam 2016-3-15

It depends what happens in the rest of your code and what you are doing as a user. In the code you have shown us the field 'rs' will only exist on handles if the user selects 'tomato' from the first popup list. If they don't click anything or they click one of the other options then 'rs' may well not exist, depending on what the rest of your code does.

When I am adding fields to handles I always tend to initialise them in the OpeningFcn rather than just randomly introduce them in some code path of some callback somewhere in the GUI.

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