def diff_f(expr, deriv_order, dims, fd_order, side=None, **kwargs):
return Derivative(expr,
*as_tuple(dims),
deriv_order=deriv_order,
fd_order=fd_order,
side=side,
**kwargs)
def diff(self, *symbols, **assumptions):
"""
Like ``sympy.diff``, but return a ``devito.Derivative`` instead of a
``sympy.Derivative``.
"""
from devito.finite_differences.derivative import Derivative
return Derivative(self, *symbols, **assumptions)
def deriv_function(expr,
deriv_order,
dims,
fd_order,
side=centered,
**kwargs):
return Derivative(expr,
*as_tuple(dims),
deriv_order=deriv_order,
fd_order=fd_order,
side=side,
**kwargs)