MATLAB: Vectors u = (2,1,0) and v = (0,1,2). calculate cos thetha where thetha is the angle between u and v

planesvectors

Please help

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u = [2 1 0];
v = [0 1 2];
costheta = dot(u,v)/(norm(u)*norm(v))
theta = acos(costheta) %n angle

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MATLAB: How to shift a fsurf plot

r = @(u,v) 2 + sin(7.*u + 5.*v);
funx = @(u,v) r(u,v).*cos(u).*sin(v);
funy = @(u,v) r(u,v).*sin(u).*sin(v);
funz = @(u,v) r(u,v).*cos(v);
% fsurf(funx,funy,funz,[0 2*pi 0 pi]); % This plot should be shifted
xshift = 2; yshift = -2;
% fsurf( @(u,v)funx(u-xshift,v-yshift), @(u,v)funy(u-xshift,v-yshift), @(u,v)funz(u-xshift,v-yshift), [0 2*pi 0 pi])
M = 100 ; N =100 ;
u = linspace(0,2*pi,M) ;
v = linspace(0,pi,N) ;
[U,V] = meshgrid(u,v) ;
X = funx(U,V)-2 ;
Y = funy(U,V)+2 ;
Z = funz(U,V) ;
surf(X,Y,Z)

MATLAB: Doesn’t atan2 (u,v) give me the right angle of two simple vectors

Of course this code replies 0. If one of the vectors is the Null vector, there cannot be an angle different from 0.

So the only problem is that you expect 54°. atan2 will not reply degrees at all, but radians.

u = [1, 0, 0]
v = [cos(0.123), -sin(0.123), 0]
atan2(norm(cross(u,v)),dot(u,v))
>> 0.1230   % As expected

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Related Solutions

MATLAB: How to shift a fsurf plot

MATLAB: Doesn’t atan2 (u,v) give me the right angle of two simple vectors

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