class_docstr: Construct a stiffness matrix in various formats of Mikota pair.
  
  The stiffness matrix `K` is square real tri-diagonal symmetric
  positive definite with integer entries. 
  
  Parameters
  ----------
  shape : tuple of int
      The shape of the matrix.
  dtype : dtype
      Numerical type of the array. Default is ``np.int32``.
  
  Methods
  -------
  toarray()
      Construct a dense array from Mikota data
  tosparse()
      Construct a sparse array from Mikota data
  tobanded()
      The format for banded symmetric matrices,
      i.e., (2, n) ndarray with 2 upper diagonals
      placing the main diagonal at the bottom.
code: def tobanded(self):
      return np.array(
          [np.pad(self._diag1, (1, 0), "constant"), self._diag0]
      )
  
imports: import numpy
  from scipy.sparse.linalg import LinearOperator
  from scipy.sparse import kron, eye, dia_array
label_desc: Use image node_id 2 for calling the MikotaK obj's underlying member method code with example usage: obj.tobanded() and returns: np