code: def filter_cat(self, axis, cat_index, cat_name):
      '''
      Filter the matrix based on their category. cat_index is the index of the category, the first category has index=1.
      '''
      run_filter.filter_cat(self, axis, cat_index, cat_namef filter_cat(self, axis, cat_index, cat_name):
      '''
      Filter the matrix based on their category. cat_index is the index of the category, the first category has index=1.
      '''
      run_filter.filter_cat(self, axis, cat_index, cat_name)
docs: Filter the matrix based on their category. cat_index is the index of the category, the first category has index=1.