docstr: Return the (dense) vector of the diagonal elements.
docstr_tok: ["Return","the","(","dense",")","vector","of","the","diagonal","elements","."]
code: def diag(self):
      """Return the (dense) vector of the diagonal elements."""
      in_diag = self.rows == self.cols
      diag = np.zeros(
          min(self.n, self.n), dtype=np.float64
      )  # default 0.
      diag[self.rows[in_diag]] = self.vals[in_diag]
      return diag
  
imports: import numpy
  from matplotlib import _api
  from matplotlib.tri import Triangulation
  from matplotlib.tri._trifinder import TriFinder
  from matplotlib.tri._tritools import TriAnalyzer
label_desc: Use image node_id 7 for calling the _Sparse_Matrix_coo obj's underlying member method code with example usage: obj.diag() and returns: diag