# Extracting a 2 dimensional array from a 3 dimensional matrix.

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ANAGHA GOURI on 26 Feb 2018
Commented: Walter Roberson on 20 Jun 2018
I have a 3D matrix named SM of order 17x10x181. I need to extract a 2D matrix from SM of order 10x181. What should be the command?

Walter Roberson on 26 Feb 2018
squeeze(SM(5,:,:))
For example. Without the squeeze it would be a 1 x 10 x 181 and the squeeze makes it 10 x 181

onur erdem korkmaz on 20 Jun 2018
Thank you for your answer. I want to ask an additional question. How do I add two matrices (10x81 add to another 10x81 in 17x10x81) with no for loop. (10x81 + 10x81 = 10x162)
Walter Roberson on 20 Jun 2018
[squeeze(SM(I, :, :), squeeze(SM(J,:,:))]
or
reshape( permute(SM([I, J], :, :), [2 3 1]), size(SM,2), [] )
Here [I, J] could be replaced by a vector of values to end up with a 10 x (81*n) array.

### More Answers (1)

KL on 26 Feb 2018
Edited: KL on 26 Feb 2018
use squeeze,
a = squeeze(yourmatrix(1,:,:))
first row from all pages. I suggest reading the doc page of squeeze.