MATLAB: 2D array

MATLABmatrix

Hi, I have a 3 by 3 matrix X(a,b,c)
I tried to define a submatrix
S = X(3,:,:);
but matlab keeps saying that S is not a 2D array. Why is that so?
Thank you very much.
Added: class(S) apparently is "double" but I don't understand why. How might I make S into a 2D array?

Best Answer

Use squeeze(). This works fine for me:
s3D = rand(4,3,2)
s2D = squeeze(s3D(2,:,:))
s3D(:,:,1) =
  0.5103    0.0183    0.1749
  0.6590    0.7794    0.2998
  0.8773    0.6623    0.7778
  0.0790    0.9458    0.6653
s3D(:,:,2) =
  0.2475    0.0516    0.3926
  0.7406    0.1848    0.6212
  0.0042    0.7256    0.4685
  0.5316    0.3404    0.1957
s2D =
  0.6590    0.7406
  0.7794    0.1848
  0.2998    0.6212
You can see that it took row 2 out of the first plane, and row 2 out of the second plane, and gave you a 3 by 2 array, just what it should have.
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