Deleting an image in an image array doesn't appear to be working

Question

Jason 2021-3-30

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https://ww2.mathworks.cn/matlabcentral/answers/788059-deleting-an-image-in-an-image-array-doesn-t-appear-to-be-working

评论： Jason 2021-4-25

Hello, I have an image array consisting of 7 images. Im using an imspinner to delete an image at the required index given by the spinner.

            currentImgIdx=app.ImSpinner.Value   %In my example i want to delete image #6
            disp('before')
            size(app.imgArray)
            app.imgArray{currentImgIdx}=[];     %I though this should delete the image at positon 6.
            disp('after')
            size(app.imgArray)

However, there appears to be no change in the size of imgArray and i can't figure out why

currentImgIdx =
          6.00
before
ans =
          1.00          7.00
after
ans =
          1.00          7.00

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Answer 1

Jan 2021-4-24

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https://ww2.mathworks.cn/matlabcentral/answers/788059-deleting-an-image-in-an-image-array-doesn-t-appear-to-be-working#answer_683940

编辑：Jan 2021-4-24

在 MATLAB Online 中打开

What is an "ImSpinner"? I do not find it in the documentation.

What is an "image array"? I guess, it is a cell array. Then:

app.imgArray(currentImgIdx) = [];

with round parentheses. Remember that C{k}=[] does not remove the k'th cell element, but sets its contents to the empty matrix. C(k)=[] does remove the element.