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user3761566
user3761566

Reputation: 87

How to convert matlab vector to 3D matrix

I have a vector s, which is of size 1*163840 which comes from sizeX * sizeY * sizeZ = 64 * 40 * 60. I want to convert the 1*163840 vector to a 3-dimensional matrix, which has 64 in x-axis, 40 in y-axis, and 64 in z-axis.

What is the easiest way to convert it?

Upvotes: 5

Views: 1909

Answers (3)

Shai
Shai

Reputation: 114796

reshape is the right way of re-aranging elements into a different shape, as pointed out by Ben.
However, one must pay attention to the order of the elements in the vector and in the resulting array:

 >> v = 1:12;
 >> reshape( v, 3, 4 )
 1     4     7    10
 2     5     8    11
 3     6     9    12

Matlab arranges the elements "column first".
If you want to get a "row first" arrangement, you'll need to be a bit more sophisticated and use permute as well

>> permute( reshape( v, 4, 3 ), [2 1] ) 
 1     2     3     4
 5     6     7     8
 9    10    11    12

See how we reshape to 4-by-3 (and not 3-by-4) and then transpose the result using permute command.

Upvotes: 1

Fantastic Mr Fox
Fantastic Mr Fox

Reputation: 33864

Use reshape to do it easily:

new_matrix = reshape(s, 64, 40, 60);

Upvotes: 4

user3810815
user3810815

Reputation: 9

initialize the matrix like so:

smatrix=zeros(64,40,60) // here you get an empty 3D matrix of the size you wanted.

use for loops to populate the matrix using your vector

for indexx=1:64
   for indexy=1:40
       for indexz=1:60
           smatrix(indexx,indexy,indexz)=s(40*60*(indexx-1)+60*(indexy-1)+indexz);
       end
   end
end

Upvotes: 0

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