Talk:Transformation matrix

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Does anyone know if it is possible to extract information from an affine matrix? Say you have a matrix rotated by 180 degrees and skewed on the X axis can you extract those two pieces of information? --47.248.0.45 16:29, 24 May 2006 (UTC)

yeah! there are various techniques to decompose a transformation matrix into one rotate, one translate and two shear operations. --Diego 13:58, 19 June 2006 (UTC)

I don't have the time to edit it, but someone should edit the section about the transformation matrix for a reflection. The version they have is fine for a line from the origin to (ux,uy), but in many cases it's easier to do it as a reflection in the line y = x tan q. The matrix would be [[cos 2q sin 2q] [sin 2q -cos 2q]] (...I think).