Removing pages with all nan values from a multidimensional array

Question

Mathan 2022-5-10

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https://ww2.mathworks.cn/matlabcentral/answers/1715620-removing-pages-with-all-nan-values-from-a-multidimensional-array

评论： Mathan 2022-5-10

Is there any way to remove pages containing all nan values from a multidimensional array. Say I have this multidimensional array:

XYZ(:,:,1) =
NaN   2.2   3.2
NaN   5.7   NaN
1.5   2.5   2.8
XYZ(:,:,2) =
NaN   NaN   NaN
11.2   92   33.73
NaN   NaN   NaN
XYZ(:,:,3) =
NaN   NaN   NaN
NaN   NaN   NaN
NaN   NaN   NaN

I would like to have XYZ(:,:,3) to be removed since that page contains all nan values and retain the other two pags. I tried (from https://www.mathworks.com/matlabcentral/answers/152251-reduce-3d-array-by-removing-nan-elements):

remove_pages = all(all(isnan(XYZ),3),2);
XYZ(remove_pages,:,:) = []

but it does not remove the 'all-nan' pages. Any guidance would be great.

Thanks

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Answer 1

Matt J 2022-5-10

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https://ww2.mathworks.cn/matlabcentral/answers/1715620-removing-pages-with-all-nan-values-from-a-multidimensional-array#answer_960875

编辑：Matt J 2022-5-10

在 MATLAB Online 中打开

discard=all(  isnan(XYZ)   ,[1,2]);
XYZ(:,:,discard)=[];

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Mathan 2022-5-10

Perfect - thank you! Wondering whether there is any documentation somehwere where I can check more details on multidimensional array (like examples or information where I can check how to remove just rows containing all nan. pages containing all nan, etc).

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