save a three dimensional matrix

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

Answer 1

[Titus Edelhofer]

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

[Fariba]

Thank you.

[Piyush Menro]

What is 'G: here in the last line before end statement. I also want to save multiple three dimenssional matrixes

[Walter Roberson]

G: in this context is the drive letter that the original poster was using to save the file.

[Walter Roberson]

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

Answer 2

[luchen li]

Hi, what does the wtpt* in

Q(:,:, b) = wtpt*GP(:,:,b) ;  means?

[Walter Roberson]

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.