def Um(m):
U = sympy_utils.eye(N)
U[1,0] = m*s**2
return U
def Uf(F):
U = sympy_utils.eye(N)
U[1,2] = -F
return U
def Us(k):
U = sympy_utils.eye(N)
U[0,1] = 1/k
return U
def Um(m):
U = sympy_utils.eye(N)
U[1,0] = m*s**2
return U
def Uf(F):
U = sympy_utils.eye(N)
U[1,2] = -F
return U
def Us(k):
U = sympy_utils.eye(N)
U[0,1] = 1/k
return U
