Why does the SQUEEZE function return the transpose of the expected output in MATLAB 7.2 (R2006a)?

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MathWorks Support Team 2010-1-21

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编辑： MathWorks Support Team 2013-12-18

I have created the following 3-D matrix:

Lb = zeros(4,3,3);
Lb(:,:,1) = [5     2     3
0     5     1
3     5    -2
2     2    -1];
Lb(:,:,2) = [ 3     0     6
4    -3     2
5     6     4
-4     2     2];
Lb(:,:,3) = [  4    -5     4
7     2     3
4    -5     5
3     3     0];

When I execute the SQUEEZE function on the third frame of the variable Lb.

squeeze(LB(3,:,:))

I receive the following result:

      3     5     4
      5     6    -5
     -2     4     5

However, I expect the following:

   5    -2
   6     4
  -5     5

since

 Lb(3,:,:) = 
 ans(:,:,1) =
      3     5    -2
 ans(:,:,2) =
      5     6     4
 ans(:,:,3) =
      4    -5     5

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Answer 1

MathWorks Support Team 2013-10-18

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squeeze2.m

This is the expected behavior of the SQUEEZE function. MATLAB interprets a sequence of values as a column vector (because MATLAB matrices are stored column-wise in memory), and therefore will take the values in

Lb(3,:,1) =
    3     5    -2

interpret them as a column vector. The same process occurs for Lb(3,:,2) and Lb(3,:,3). The three results are then put together in the resulting matrix:

      3     5     4
      5     6    -5
     -2     4     5

To work around this issue, use the attached function, squeeze2.m, which will detect the size of the input matrix, and transpose the result from the SQUEEZE function accordingly.