a = [2 3 4];
b = [3 5 2];
c = [1 1 1];

aplusb = a + b;
bplusa = b + a;
is_equal = (aplusb == bplusa)
is_equal_using_isequal = isequal(aplusb,bplusa)

figure
grid on
quiver3(0, 0,0, 2, 3,4, 1)
hold on
axis equal
quiver3(0, 0,0, 3, 5,2)
quiver3(0, 0,0, aplusb(1), aplusb(2), aplusb(3))



aplusbandthenplusc = (a + b) + c;
aplusbplusc = a + (b + c);
is_equal = (aplusbandthenplusc == aplusbplusc)
is_equal_using_isequal = isequal(aplusbplusc, aplusbandthenplusc)

figure
grid on
quiver3(0, 0,0, 2, 3,4, 1)
hold on
axis equal
quiver3(0, 0,0, 3, 5,2)
quiver3(0,0,0,c(1),c(2),c(3))
quiver3(0, 0,0, aplusbplusc(1), aplusbplusc(2), aplusbplusc(3))