⌈1 0⌉⌈x⌉=⌈ x⌉
⌊0 1⌋⌊y⌋=⌊y⌋
The above 2x2 matrix reflects a point over the xaxis. (x,y)→(x,y).
Derive a matrix that will reflect a point over the line y=kx.
[cos(2*atan(k)) sin(2*atan(k))]
[sin(2*atan(k)) cos(2*atan(k))]
Ref(theta) = [cos 2*theta sin 2*theta]
[sin 2*theta cos 2*theta]
But, Jer, I couldn't find anywhere, the codes for the partial square brackets, sometimes used for floor and ceiling.
PS: Well I now found the codes, but they don't seem to be recognized in the "View Source" view, when going back to the regular view. (&bracketlefttp; etc.)
Edited on April 1, 2015, 4:18 pm

Posted by Charlie
on 20150401 16:10:17 