code: def calc_one_vert_gauss(one_vert, xyz=None, std=None):
      
      trans = empty(xyz.shape[0])
      for i, one_xyz in enumerate(xyz):
          trans[i] = gauss(norm(one_vert - one_xyz), std)
      return trans
docs: Calculate how many electrodes influence one vertex, using a Gaussian
      function.
  
      Parameters
      ----------
      one_vert : ndarray
          vector of xyz position of a vertex
      xyz : ndarray
          nChan X 3 with the position of all the channels
      std : float
          distance in mm of the Gaussian kernel
  
      Returns
      -------
      ndarray
          one vector with values for one vertex