Calculating angle between 2 vectors

xx = rand (1,16);
yy = rand (1,16);
zz = rand (1,16);

A = [xx yy zz]; % First Vector

pp = rand (1,16);
qq = rand (1,16);
rr = rand (1,16);
B = [pp qq rr]; % Second Vector

Can any one help me to calculate the angle between A and B vectors .

Thanks in ADVANCE !!!!

Answer 1

[Mahmoud Ashraf]

xx = rand (1,16);

yy = rand (1,16);

zz = rand (1,16);

A = [xx yy zz]; % First Vector

pp = rand (1,16);

qq = rand (1,16);

rr = rand (1,16);

B = [pp qq rr]; % Second Vector

angle = acos(dot(A,B)/(norm(A)*norm(B)))