class_docstr: Class for the vector space of lower triangular matrices of size n.
  
  Parameters
  ----------
  n : int
      Integer representing the shapes of the matrices: n x n.
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docstr: Make a square matrix lower triangular by zeroing out other elements.
  
  Parameters
  ----------
  point : array-like, shape=[..., n, n]
      Matrix.
  
  Returns
  -------
  sym : array-like, shape=[..., n, n]
      Symmetric matrix.
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code: def projection(self, point):
      """Make a square matrix lower triangular by zeroing out other elements.
  
      Parameters
      ----------
      point : array-like, shape=[..., n, n]
          Matrix.
  
      Returns
      -------
      sym : array-like, shape=[..., n, n]
          Symmetric matrix.
      """
      return gs.tril(point)
  
file_path: geomstats/geomstats/geometry/lower_triangular_matrices.py
imports: import geomstats.backend
  from geomstats.geometry.base import MatrixVectorSpace
  from geomstats.geometry.matrices import Matrices, MatricesMetric
label_desc: Use image node_id 6 for calling the LowerTriangularMatrices obj's underlying member method code with example usage: obj.projection(point) and returns: gs