How can I rotate a set of points around an axis?

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Jonathan Babitsch
评论： Jonathan Babitsch 2020-6-8
Hi everybody,
I have a question concerning a mathematical problem that I would like to solve.
If I have a Matrix 8x3, and like every line in the matrix describes a point, how can i rotate all the points in the matrix for example around the z axis?
I have tried it with a rotaionmatrix, but does that work? What does my code need to look like?
I'm sorry I don't really know how to do that. I have the following:
Above is the Code where I calculate the rotation matrix, and here is the set of points I would like to rotate:
Thanks a lot for your replies in advance, I'm glad for any help. I'm new to Matlab so I don't really know how to do this.
Have a nice evening,
Johnny

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James Tursa
James Tursa 2020-6-8
编辑：James Tursa 2020-6-8
Arrange your points as column vectors and do a matrix multiply. E.g.,
result = rotmxXYZ * K.';
The result will have your points as column vectors also.
If you really need them in rows, then transpose result, or do this:
result = K * rotmxXYZ';
  1 个评论
Jonathan Babitsch
Jonathan Babitsch 2020-6-8
That was easy, just didn`t pay attention to the rules of matrix multiplication...Thank you very much for your help James! I really appreciate it!
Have a nice day sir!

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