docstr: The field on the grid points of the domain.
docstr_tok: ["The","field","on","the","grid","points","of","the","domain","."]
code: def on_grid(self):
      r"""The field on the grid points of the domain."""
      return self.params
  
imports: import warnings
  from typing import Callable, TypeVar
  import equinox
  from equinox import tree_equal
  from jax import eval_shape
  from jax import numpy
  from jax import vmap
  from jaxtyping import PyTree
  from jaxdf.core import Field
  from jaxdf.geometry import Domain
label_desc: Use image node_id 8 for calling the OnGrid obj's underlying member method code with example usage: obj.on_grid() and returns: self