save a three dimensional matrix

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Fariba
Fariba on 16 Aug 2012
Edited: Walter Roberson on 4 Sep 2020
How can i save a three dimensional matrix. The following does not work
for b=1:size(GP,3);
Q(:,:,b)=wtpt*GP(:,:,b);
save('G:\.........\Q.txt','Q','-ASCII','-double');
end
Thanks

Accepted Answer

Titus Edelhofer
Titus Edelhofer on 16 Aug 2012
Hi,
you have two options: one would be to save the individual slices
for b=1:size(GP, 3)
Q(:,:, b) = wtpt*GP(:,:,b);
A = Q(:,:,b);
save(sprintf('G:\Q_%d.txt', b), 'A', '-ASCII', '-double');
end
The alternative would be to use reshape to make it a 2D matrix, and when you load it, reshape it back to a 3D matrix. It depends what you need the ascii output for.
Titus
  4 Comments
Walter Roberson
Walter Roberson on 4 Sep 2020
None of the following support saving 3d matrices in 3d form:
  • save -ascii
  • dlmwrite
  • xlswrite
  • writetable, writematrix, writecell
  • imwrite for most image types
The following are some of the formats that support saving 3d matrices as 3d:
  • save (not -ascii)
  • Tiff class
  • dicomwrite
  • imwrite for a few image formats such as tiff
  • EDF file format support
  • HDF file format support
  • json

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More Answers (1)

luchen li
luchen li on 2 Nov 2017
Hi, what does the wtpt* in
Q(:,:, b) = wtpt*GP(:,:,b) ; means?
  1 Comment
Walter Roberson
Walter Roberson on 2 Nov 2017
That is something form the user's original code. We do not have any information on what the user was attempting to compute back then. It is not relevant to the matter of saving 3D arrays: it just illustrates how the user was constructing the 3D array.

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