Subscripted Assignment Dimension Mismatch when using ROIPOLY in a GUI

Hi. I'm fairly new to all of this stuff, so I'm having a hard time comprehending what could be going wrong. I've searched around, and nothing has really made it clear.

I have a GUI script that seeks to segment portions on an image (derived from a .mat file with numerous variables) using roipoly. For the most part it works... But there are a few bugs, one involving this error occurring, and the quickest way to fix it is to close and reopen the GUI, which is not ideal. I'm having a hard time tracing through the program to find what could cause it to only sometimes happen.

Here's where the error occurs (idx is usually just 1):

     while go == 0
          [handles.x_crop_pandn,...
              handles.y_crop_pandn,...
              handles.BW_crop(:,:,idx),...
              handles.xi_crop_pandn(:,idx),...
              handles.yi_crop_pandn(:,idx)] = roipoly();

And the error:

Subscripted assignment dimension mismatch.
Error in HistologySegmentationGUI>pushbutton8_Callback (line 287)
        [handles.x_crop_pandn,...  
Error in gui_mainfcn (line 96)
        feval(varargin{:});  
Error in HistologySegmentationGUI (line 42)
    gui_mainfcn(gui_State, varargin{:});  
Error in @(hObject,eventdata)HistologySegmentationGUI('pushbutton8_Callback',hObject,eventdata,guidata(hObject))     
Error while evaluating uicontrol Callback

And, if I do size( these variables: (just in case it provides any useful info that I don't understand)

K>> size(handles.x_crop_pandn)  
ans =  
           1        4721

K>> size(handles.y_crop_pandn)
 ans =  
     1   210

K>> size(handles.yi_crop_pandn)  
ans =  
    23     1

K>> size(handles.xi_crop_pandn)
ans =  
    23     1

K>> size(handles.BW_pandn)
ans = 
        1370        4721

Let me know if you have any guidance, thoughts, or need for more information. Thank you!

Answer 1

[Image Analyst]

Assign them to single variables first, like the help shows you. Then, after that, stuff them into 3D arrays or whatever.

[Alexander Ross]

This simplified things a lot. Thank you.