def Eigen_Vectors2(A,lambdas=[]):
if (not lambdas): lambdas=A.Eigen_Values()
v0=Vector([
lambdas[0]-A[0][0],
A[1][0]
])
if (abs(lambdas[0]-A[0][0])==0.0):
v0=Vector([1.0,0.0])
v0=v0.Normalize()
v1=v0.Transverse2()
return Matrix([
[ v0[0],v1[0] ],
[ v0[1],v1[1] ],
])
