class_docstr: temporary class to handle meshes
class_docstr_tok: ["temporary","class","to","handle","meshes"]
docstr: Initialize mesh domain instance
  
  Parameters
  ----------
  coord: array of shape (n_vertices, 3),
         the node coordinates
  triangles: array of shape(n_triables, 3),
             indices of the nodes per triangle
code: def __init__(self, coord, triangles):
      """Initialize mesh domain instance
  
      Parameters
      ----------
      coord: array of shape (n_vertices, 3),
             the node coordinates
      triangles: array of shape(n_triables, 3),
                 indices of the nodes per triangle
  
      """
      self.coord = coord
      self.triangles = triangles
      self.V = len(coord)
  
imports: import numpy
  import scipy.sparse
  from nibabel import Nifti1Image, load, save
  from nipy.algorithms.graph import WeightedGraph, wgraph_from_3d_grid, wgraph_from_coo_matrix
  from nipy.io.nibcompat import get_affine, get_header
label_desc: Use image node_id 1 to create a new MeshDomain object  with example: obj = MeshDomain(coord, triangles)