code: def testNumpyMatrixThreeColumns(self):
      self.templatePackUnpack(
          numpy.array(
              [[1.1, 2.2, 3.3], [2.2, 3.3, 4.4], [3.3, 4.4, 5.5]]
          ),
          c_double,
      )
  
imports: import unittest
  import numpy
  from pyclustering.core.pyclustering_package import package_builder, package_extractor
  from ctypes import c_ulong, c_size_t, c_double, c_uint, c_float, c_char_p
label_desc: Use image node_id 26 for calling the Test obj's underlying member method code with example usage: obj.testNumpyMatrixThreeColumns() without return types