def __init__(self, function_label, order=(0, 0), weight_label=None, location=None):
"""
:param : order tuple of temporal_order and spatial_order
:param : factor
:param : location
"""
if not isinstance(order, tuple) or len(order) > 2:
raise TypeError("order mus be 2-tuple of int.")
if any([True for n in order if n < 0]):
raise ValueError("derivative orders must be positive")
if sum(order) > 2:
raise ValueError("only derivatives of order one and two supported")
if location is not None:
if location and not isinstance(location, Number):
raise TypeError("location must be a number")
if not is_registered(function_label):
raise ValueError("Unknown function label '{0}'!".format(function_label))
if weight_label is None:
weight_label = function_label
elif not isinstance(weight_label, str):
raise TypeError("only strings allowed as 'weight_label'")
Placeholder.__init__(self, {"func_lbl": function_label, "weight_lbl": weight_label},
order=order, location=location)
def __init__(self, function_label, order=0, location=None):
if not is_registered(function_label):
raise ValueError("Unknown function label '{0}'!".format(function_label))
Placeholder.__init__(self, {"func_lbl": function_label}, order=(0, order), location=location)
