code: def test_burkardt_11(self):
      # This is Ward's example #2.
      # It is a symmetric matrix.
      A = np.array(
          [
              [
                  29.87942128909879,
                  0.7815750847907159,
                  -2.289519314033932,
              ],
              [
                  0.7815750847907159,
                  25.72656945571064,
                  8.680737820540137,
              ],
              [
                  -2.289519314033932,
                  8.680737820540137,
                  34.39400925519054,
              ],
          ],
          dtype=float,
      )
      assert_allclose(scipy.linalg.eigvalsh(A), (20, 30, 40))
      desired = np.array(
          [
              [
                  5.496313853692378e15,
                  -1.823188097200898e16,
                  -3.047577080858001e16,
              ],
              [
                  -1.823188097200899e16,
                  6.060522870222108e16,
                  1.012918429302482e17,
              ],
              [
                  -3.047577080858001e16,
                  1.012918429302482e17,
                  1.692944112408493e17,
              ],
          ],
          dtype=float,
      )
      actual = expm(A)
      assert_allclose(actual, desired)
  
imports: import math
  import numpy
  from numpy import array, eye, exp, random
  from numpy.testing import assert_allclose, assert_, assert_array_almost_equal, assert_equal, assert_array_almost_equal_nulp, suppress_warnings
  from scipy.sparse import csc_matrix, csc_array, SparseEfficiencyWarning
  from scipy.sparse._construct import eye
  from scipy.sparse.linalg._matfuncs import expm, _expm, ProductOperator, MatrixPowerOperator, _onenorm_matrix_power_nnm, matrix_power
  from scipy.sparse._sputils import matrix
  from scipy.linalg import logm
  from scipy.special import factorial, binom
  import scipy.sparse
  import scipy.sparse.linalg
label_desc: Use image node_id 24 for calling the TestExpM obj's underlying member method code with example usage: obj.test_burkardt_11() without return types