This object represents data defined on a mesh_im object.
MIMD = gf_mesh_im_data(mesh_im mim, int region, ivec size)
General constructor for mesh_im_data objects.
This object represents data defined on a mesh_im object.
MIMD = gf_mesh_im_data(mesh_im mim, int region, ivec size)
Build a new mesh_imd object linked to a mesh_im object. If region is
    provided, considered integration points are filtered in this region.
    size is a vector of integers that specifies the dimensions of the
    stored data per integration point. If not given, the scalar stored
    data are considered.
Y. Collette