Rotate a 4D matrix

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Matt
Matt 2015-10-14
评论： Matt 2015-10-14
Hello,
I have a 4D matrix at the moment which contains coordinates (X, Y, Z). I would like to know how can I rotate that matrix easily? I know the rotation matrices in space (these are 3x3 matrices) upon X, Y, and Z axes but I fail to do in 1 line the rotation of my 4D matrix.
If I extract a single value from the matrix, and rotate it using a rotation matrix it works, but how can I rotate the whole 4D matrix? For example I extract a value of my 4D matrix:
AA=D(2,5,44,:)
I make sure I have the coordinates on 1 line:
AA2=AA(1,:)
I rotate the point:
AA2rot=AA2*Rotz
Rotz is a 3x3 rotation matrix. And this works, but how can I do it for all elements of my 4D matrix (D)?

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Walter Roberson
Walter Roberson 2015-10-14
AA2 = reshape(D, [], 3);
AA2rot = AA2 * RotZ;
AArot = reshape(AA2rot, size(D));
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Matt
Matt 2015-10-14
Awesome thanks a lot! I learned the use of the reshape function. Very useful!

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