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+//find pointing vector and direction of power flow of microwave
+//given
+clc
+function w=cross_prod(E,H)//function to determine the cross product of two vector
+D=[E(:),H(:)]
+w(1)=det([[1;0;0],D])
+w(2)=det([[0;1;0],D])
+w(3)=det([[0;0;1],D])
+endfunction
+E=1*[1 0 0]//electric field towards ax
+H=2*[0 1 0]//magnetic field towards ay
+q=cross_prod(E,H)
+disp(q','the display is along az axis')//along az
+//ERROR in the book as cross product of two perpendicular vector is  the third vector