code: def dtrtrs(A, B, lower=1, trans=0, unitdiag=0):
      
      A = np.asfortranarray(A)
      #Note: B does not seem to need to be F ordered!
      return lapack.dtrtrs(A, B, lower=lower, trans=trans, unitdiag=unitdiag)
docs: Wrapper for lapack dtrtrs function
  
      DTRTRS solves a triangular system of the form
  
          A * X = B  or  A**T * X = B,
  
      where A is a triangular matrix of order N, and B is an N-by-NRHS
      matrix.  A check is made to verify that A is nonsingular.
  
      :param A: Matrix A(triangular)
      :param B: Matrix B
      :param lower: is matrix lower (true) or upper (false)
      :returns: Solution to A * X = B or A**T * X = B