code: def elementary_vector(n, i):
      v = np.zeros(n, dtype=float)
      v[i] = 1
      return v
  
file_path: catboost/contrib/python/scipy/py2/scipy/sparse/linalg/_onenormest.py
imports: from __future__ import division, print_function, absolute_import
  import numpy
  from scipy.sparse.linalg import aslinearoperator
label_desc: Use image node_id 6 for calling a global function with example usage: elementary_vector(n, i) and returns: v