[ITK-users] Silly question on itk::Matrix

[Jim Miller]

ITK standard is that points are column vectors. Thus, matrix times a point a point is defined as Mat * P

Jim

> On Aug 22, 2014, at 3:30 AM, vincent ngai <vincent.ngai at gmail.com> wrote:
> 
> Hi all, pardon me for this silly question on itk::Matrix. Why do I need to transpose a translation matrix after I copy the [x,y,z] translation values to the matrix[3].
> 
> I know conceptually it should not really matter whether its row or col major so long as you can 
> post multiply or pre multiply with another vector. But the way operator*() works only allows for
> Matrix * P, and when I test the simple case of TranslationMatrix * Point, I would have to transpose the matrix. If I could also do Point * TranslationMatrix, then i wouldn't need to transpose.
> 
> Any ideas?
> 
> -- 
> Regards,
> Vincent
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