python - What does the following error message mean for an inverse matrix? -

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i include of code, because don't know error comes from. here is:

import numpy np import sympy sy sympy import matrix numpy import linalg mu = list(range(16)) # represent possible components (of   metric) in 1 line array.   t, x, y, z = sy.symbols("t x y z")  # spacetime coordinates. lettercoords = [t, x, y, z]  # coords in list easy access numcoords = [0, 1, 2, 3]  # coords in numbers   class metrictensor:  # metric tensor class def __init__(self, g0, g1, g2, g3, g4, g5, g6, g7, g8, g9, g10, g11, g12, g13, g14, g15):  # metric components     self.g0 = g0     self.g1 = g1     self.g2 = g2     self.g3 = g3     self.g4 = g4     self.g5 = g5     self.g6 = g6     self.g7 = g7     self.g8 = g8     self.g9 = g9     self.g10 = g10     self.g11 = g11     self.g12 = g12     self.g13 = g13     self.g14 = g14     self.g15 = g15  def lmetric(self):     lstmetric = [self.g0, self.g1, self.g2, self.g3, self.g4, self.g5, self.g6, self.g7, self.g8, self.g9, self.g10, self.g11, self.g12, self.g13, self.g14, self.g15]     lmetric = list(lstmetric)     return lmetric  def mmetric(self, lmetric):     mmetric = matrix([[lmetric[0], lmetric[1], lmetric[2], lmetric[3]], [lmetric[8], lmetric[9], lmetric[10], lmetric[11]], [lmetric[4], lmetric[5], lmetric[6], lmetric[7]], [lmetric[12], lmetric[13], lmetric[14], lmetric[15]]])     return mmetric  def invmmetric(self, mmetric):         invmmetric = np.linalg.inv(mmetric)         return invmmetric  def linvmetric(self, invmmetric):     linvmetric = list(invmmetric)     return linvmetric

this code entering components g0...g15. example:

g0 = input("enter g0:") ... g15 = input("enter g15:")   mt = metrictensor(g0, g1, g2, g3, g4, g5, g6, g7, g8, g9, g10, g11, g12,     g13, g14, g15) lmetric = mt.lmetric() mmetric = mt.mmetric(lmetric) invmmetric = mt.invmmetric(mmetric) linvmetric = mt.linvmetric(invmmetric)

i trying create program computes einstein tensor given metric tensor.i have got 'math' part covered, i'm having problems code.

when run program , enter 16 g(n) components, get:

    traceback (most recent call last):   file "/users/irene/pycharmprojects/efe/efe.py", line 70, in <module>     invmmetric = mt.invmmetric(mmetric)   file "/users/irene/pycharmprojects/efe/efe.py", line 42, in invmmetric     invmmetric = np.linalg.inv(mmetric)   file "/library/frameworks/python.framework/versions/3.5/lib/python3.5/site-packages/numpy/linalg/linalg.py", line 526, in inv     ainv = _umath_linalg.inv(a, signature=signature, extobj=extobj) typeerror: no loop matching specified signature , casting found ufunc inv

it seems problem inversing matrix symbolically. if can help, in advance.


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