def assembleobsop(bc, V, Points):
"""
Short version of assembleobervationoperator that only assembles the
observation operator Dr at the receivers
Inputs:
bc = boundary condition as assembled by DirichletBC
V = Function space as assembled by FunctionSpace
Points = points where observation should be made
"""
v = TestFunction(V); f = Constant('0'); L = f*v*dx;
b = assemble(L); bc.apply(b);
# Observation points
Nr = len(Points)
Dobs = np.zeros(Nr*b.size(), float)
Dobs = Dobs.reshape((Nr, b.size()), order='C')
# Dobs = lil_matrix((Nr, b.size()), dtype='float')
ii = 0
for obs in Points:
delta = PointSource(V, list2point(obs))
bs = b.copy(); delta.apply(bs); bs = bs.array()
Dobs[ii,:] = bs.transpose()
ii += 1
return csr_matrix(Dobs)
def generate_sources(V, b, Data):
Bsource = []
for source in Data['sources']:
delta = PointSource(V, list2point(source))
bs = b.copy(); delta.apply(bs);
Bsource.append(bs)
return Bsource
