What should I do if I want to rotate a line?

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Donghui Sun
Donghui Sun 2013-10-23
回答： Friedrich 2013-10-23
For example, we have line : y = 2*x; I want to rotate the line by 30 degrees in a counterclockwise direction.
What should I do ? Any suggestions?

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Friedrich
Friedrich 2013-10-23
Hi,
In the case its rotating around the origin see here.
f = @(x) 2*x;
x = 0:0.1:10;
angl = 90;
rot_mat = @(angl) [cos(angl) -sin(angl); sin(angl) cos(angl)];
mat = rot_mat(deg2rad(angl));
f_rot = mat*[x;x*2];
plot(x,f(x),f_rot(1,:),f_rot(2,:));
legend('original','rotated')

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