- #1
Pin Head
- 23
- 0
hi,
I understand how to do the rotation equation
A = [ cosθ -sinθ
sinθ cosθ]
A*v = [ cosθ -sinθ * [ x = [ xcosθ - ysinθ
sinθ cosθ] y ] xsinθ + ycosθ ]
A*v = [ cos90 -sin90 * [ 6
sin90 cos90 ] 4 ]
= [ 0, -1 * [ 6 = [ 0 * 6 - 1 * 4 = [ -4
1, 0 ] 4 ] 1 * 6 + 0 * 4 ] 6 ]
but the textbook I am using doesn't go into using different angle as you can see this is a 90 degree equation but what if I wanted to use 30 degrees or 5 degree instead.I have look on the internet for some advice but don't seem to be able to find some?
I understand how to do the rotation equation
A = [ cosθ -sinθ
sinθ cosθ]
A*v = [ cosθ -sinθ * [ x = [ xcosθ - ysinθ
sinθ cosθ] y ] xsinθ + ycosθ ]
A*v = [ cos90 -sin90 * [ 6
sin90 cos90 ] 4 ]
= [ 0, -1 * [ 6 = [ 0 * 6 - 1 * 4 = [ -4
1, 0 ] 4 ] 1 * 6 + 0 * 4 ] 6 ]
but the textbook I am using doesn't go into using different angle as you can see this is a 90 degree equation but what if I wanted to use 30 degrees or 5 degree instead.I have look on the internet for some advice but don't seem to be able to find some?