u= 0.185689 0.688531 0.715891
v= 0.694503 0.247127 -0.231237
u={ 0.185689, 0.688531, 0.715891 } 
v={ 0.694503, 0.247127, -0.231237 } 
-u  = -0.185689 -0.688531 -0.715891
test= -0.185689 -0.688531 -0.715891

test 'unary -' passed

u+v = 0.880193 0.935659 0.484655
test= 0.880193 0.935659 0.484655
test '+' passed

u-v = -0.508814 0.441404 0.947128
test= -0.508814 0.441404 0.947128
test '-' passed