Extracting a 2 dimensional array from a 3 dimensional matrix.

2015 5 1
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更新时间：2018 9 6
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If I have a 3 dimensional matrix, with rows 1 through 10, columns a through z and pages 1 through 4, how do I extract a 2 dimensional array containing the leftmost slab of data, that is, all the column "a" data for all four pages? This would be a 10 x 4 array, with all the data from columns "a" (or 1 if you prefer numeric).
I will rearrange said data, and then want to reinstall the rearranged data in its original place in the 3 dimensional matrix.
Any help would be appreciated.

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Joseph Cheng
Joseph Cheng 2015-5-1
编辑：Joseph Cheng 2015-5-1

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so you have a matrix of 10 rows, 26 columns and 4 deep. That would be a 10x26x4 matrix. to get just all rows for column a for all pages is this example that is a bit easier to see
Testmat= randi(10,2,3,4);))
A = squeeze(Testmat(:,1,:))
A = A*0
Testmat(:,1,:) = A

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