Cell contents reference from a non-cell array object error

Question

Aaron Smith 2017-8-2

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/351244-cell-contents-reference-from-a-non-cell-array-object-error

回答： Jan 2017-8-10

pushbutton3_Callback.m

I have a code for selecting regions of interest on an image, create a mask and then apply this mask to the matrices in a cell array. The problem that is occurring is that Matlab says the cell contents reference a non-cell array object.

Cell contents reference from a non-cell array object.
Error in hopefully_the_last_window>pushbutton3_Callback (line 191)
    Y = X{i}.*mask;
Error in gui_mainfcn (line 96)
        feval(varargin{:});
Error in hopefully_the_last_window (line 42)
    gui_mainfcn(gui_State, varargin{:});
Error in
@(hObject,eventdata)hopefully_the_last_window('pushbutton3_Callback',hObject,eventdata,guidata(hObject))
Error while evaluating uicontrol Callback

I read on another answer on Mathworks that changing the {} brackets in my code to standard brackets () would fix this error ( changing Y = X{i}.*mask to Y = X(i).*mask). When I did this Matlab simply froze and stopped responding. Is this fix a decent solution to the error with some tweaks to stop matlab freezing or is there another possible cause of the error than the bracket?

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Answer 1

Jan 2017-8-10

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/351244-cell-contents-reference-from-a-non-cell-array-object-error#answer_277557

在 MATLAB Online 中打开

Look at the code:

X = handles.finishCell;
mask = labeledImage;
for i = 1 : numel(X)
    Y = X{i}.*mask;
end

We cannot know, what the contents of "handles.finishCell" is. The error message tells clearly, that it is not a cell array. Then simply using round parenthesis is pure guessing. You have to find out, what the contents of this variable is. Do not apply a solution, which was posted for perhaps a completely different problem.

Note that Y is overwritten in each iteration. Perhaps you want Y{i} also. Then some lines later:

handles.X = Y{i};

Are you sure, that you want the last element of Y only?