old_contents: # -*- coding: utf-8 -*-
  # This file is part of the pyMOR project (http://www.pymor.org).
  # Copyright Holders: Felix Albrecht, Rene Milk, Stephan Rave
  # License: BSD 2-Clause License (http://opensource.org/licenses/BSD-2-Clause)
  
  from __future__ import absolute_import, division, print_function
  
  import numpy as np
  
  from pymor.core import ImmutableInterface
  from pymor.domaindescriptions import RectDomain
  from pymor.functions import ConstantFunction
  from pymor.tools import Named
  
  
  class InstationaryAdvectionProblem(ImmutableInterface, Named):
      '''Instationary advection problem.
  
      The problem is to solve ::
  
          ∂_t u(x, t, μ)  +  ∇ ⋅ f(u(x, t, μ), t, μ) = s(x, t, μ)
                                          u(x, 0, μ) = u_0(x, μ)
  
      for u with t in [0, T], x in Ω.
  
      Parameters
      ----------
      domain
          A |DomainDescription| of the domain Ω the problem is posed on.
      flux_function
          The |Function| f. The current time is provided by adding the key `'_t'`
          the the |Parameter| `mu`.
      flux_function_derivative
          The derivative of f with respect to u.
      rhs
          The |Function| s. The current time is provided by adding the key `'_t'`
          to the |Parameter| `mu`.
      dirichlet_data
          |Function| providing the Dirichlet boundary values in global coordinates.
      T
          The end time T.
      name
          Name of the problem.
  
      Attributes
      ----------
      domain
      rhs
      flux_function
      flux_function_derivative
      initial_data
      dirichlet_data
      T
      '''
  
      def __init__(self, domain=RectDomain(), rhs=ConstantFunction(dim_domain=2),
                   flux_function=ConstantFunction(value=np.array([0, 0]), dim_domain=2),
                   flux_function_derivative=ConstantFunction(value=np.array([0, 0]), dim_domain=2),
                   dirichlet_data=ConstantFunction(value=0, dim_domain=2),
                   initial_data=ConstantFunction(value=1, dim_domain=2), T=1, name=None):
          self.domain = domain
          self.rhs = rhs
          self.flux_function = flux_function
          self.flux_function_derivative = flux_function_derivative
          self.dirichlet_data = dirichlet_data
          self.initial_data = initial_data
          self.T = T
          self.name = name
  
new_contents: # -*- coding: utf-8 -*-
  # This file is part of the pyMOR project (http://www.pymor.org).
  # Copyright Holders: Felix Albrecht, Rene Milk, Stephan Rave
  # License: BSD 2-Clause License (http://opensource.org/licenses/BSD-2-Clause)
  
  from __future__ import absolute_import, division, print_function
  
  import numpy as np
  
  from pymor.core import ImmutableInterface
  from pymor.domaindescriptions import RectDomain
  from pymor.functions import ConstantFunction
  from pymor.tools import Named
  
  
  class InstationaryAdvectionProblem(ImmutableInterface, Named):
      '''Instationary advection problem.
  
      The problem is to solve ::
  
          ∂_t u(x, t, μ)  +  ∇ ⋅ f(u(x, t, μ), t, μ) = s(x, t, μ)
                                          u(x, 0, μ) = u_0(x, μ)
  
      for u with t in [0, T], x in Ω.
  
      Parameters
      ----------
      domain
          A |DomainDescription| of the domain Ω the problem is posed on.
      flux_function
          The |Function| f. The current time is provided by adding the key `'_t'`
          the the |Parameter| `mu`.
      flux_function_derivative
          The derivative of f with respect to u.
      rhs
          The |Function| s. The current time is provided by adding the key `'_t'`
          to the |Parameter| `mu`.
      dirichlet_data
          |Function| providing the Dirichlet boundary values in global coordinates.
      initial_data
          |Function| providing the initial values in global coordinates.
      T
          The end time T.
      name
          Name of the problem.
  
      Attributes
      ----------
      domain
      rhs
      flux_function
      flux_function_derivative
      initial_data
      dirichlet_data
      T
      '''
  
      def __init__(self, domain=RectDomain(), rhs=ConstantFunction(dim_domain=2),
                   flux_function=ConstantFunction(value=np.array([0, 0]), dim_domain=2),
                   flux_function_derivative=ConstantFunction(value=np.array([0, 0]), dim_domain=2),
                   dirichlet_data=ConstantFunction(value=0, dim_domain=2),
                   initial_data=ConstantFunction(value=1, dim_domain=2), T=1, name=None):
          self.domain = domain
          self.rhs = rhs
          self.flux_function = flux_function
          self.flux_function_derivative = flux_function_derivative
          self.dirichlet_data = dirichlet_data
          self.initial_data = initial_data
          self.T = T
          self.name = name
  
subject: update documentation