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+//clear//

+//Caption: Program to find the phase angle between two vectors

+//Example1.2

+//page 11

+clc;

+Q = [4,5,2]; //point Q

+x = Q(1);

+y = Q(2);

+z = Q(3);

+G = [y,-2.5*x,3]; //vector field

+disp(G,'G(rQ) =')

+aN = [2/3,1/3,-2/3]; //unit vector- direction of Q

+G_dot_aN = dot(G,aN); //dot product of G and aN

+disp(G_dot_aN,'G.aN =')

+G_dot_aN_aN = G_dot_aN*aN;

+disp(G_dot_aN_aN,'(G.aN)aN=')

+teta_Ga = Phase_Angle(G,aN) //phase angle between G and unit vector aN

+disp(teta_Ga,'phase angle between G and unit vector aN in degrees =')

+//Result

+// G(rQ) =       5.  - 10.    3.  

+// G.aN =      - 2.  

+// (G.aN)aN =     - 1.3333333  - 0.6666667    1.3333333  

+// phase angle between G and unit vector aN in degrees =   99.956489