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fe.py
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			import abc


			class Solver(metaclass=abc.ABCMeta):
			@abc.abstractmethod
			def solveStep(self):
			pass

			def _zero_rows(self, A, rows):
			for r in rows:
			diag = A[r, r]
			# zeros the lines defined in b
			A.data[A.indptr[r]:A.indptr[r + 1]] = 0.
			A[r, r] = diag


			class Model(metaclass=abc.ABCMeta):
			@abc.abstractmethod
			def applyDirichletBC(self):
			pass

			@abc.abstractmethod
			def f_int(self):
			pass

			@property
			@abc.abstractmethod
			def f_ext(self):
			pass

			@property
			@abc.abstractmethod
			def K(self):
			pass

			@property
			@abc.abstractmethod
			def M(self):
			pass

			@property
			@abc.abstractmethod
			def C(self):
			pass

			@property
			@abc.abstractmethod
			def blocked(self):
			pass