Method subvolume

src/vec.cpp:1626–1634

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grid_volume grid_volume::subvolume(ivec is, ivec ie, component c) {
  if (!(contains(is) && contains(ie))) meep::abort("invalid extents in subvolume");
  grid_volume sub;
  sub.dim = dim;
  sub.a = a;
  sub.inva = inva;
  sub.init_subvolume(is, ie, c);
  return sub;
}

void grid_volume::init_subvolume(ivec is, ivec ie, component c) {
  ivec origin(dim, 0);